Santana is buying a guitar string.
Some of the strings are on sale.
Select the string that will be cheapest.




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Santana is buying a guitar string.
Some of the strings are on sale.
Select the string that will be cheapest.




`text(Sale: take 20% off)`
`text(C)text(ost of each option:)`
`$17`
`$35\ text(less 50%) = $17.50`
`text($20 less 20%) = 20  4 = $16`
`text($24 less 25%) = 24  6 = $18`
`:.\ text(Sale: take 20% off is the cheapest string.)`
Michael purchases a 3D printer worth $2 490 000.
He was given a 10% discount.
What was the price paid by Michael after the discount?
$ 
`$2\ 241\ 000`
`text(Discount)`  `= 10text(%) xx 2\ 490\ 000` 
`= 249\ 000` 
`:.\ text(Price)`  `= 2\ 490\ 000  249\ 000` 
`= $2\ 241\ 000` 
A hockey stick is on sale, reduced from $220 to $165.
What percentage discount has been applied?
`text(25%)`  `text(33%)`  `text(45%)`  `text(55%)` 




`text(25%)`
`text(Discount)`  `= text(reduction)/text(original price) xx 100` 
`= ((220  165))/220 xx 100`  
`= 25text(%)` 
The population of Australian states in 2015 and 2016 is recorded in the table below.
Some data for Western Australia is not shown.
What was the population of Western Australia (WA) close to in 2016?
`2\ 773\ 100`  `2\ 710\ 500`  `2\ 147\ 600`  `2\ 091\ 300` 




`2\ 091\ 300`
`text(WA Population in 2016)`
`= 2\ 085\ 021 xx 1.003`
`~~ 2\ 091\ 300`
Don buys a cricket ball, originally marked $30, that is discounted by 25%.
He also has a loyalty card that gives him another 20% off the sale price.
What is the final cost of the ball?
$ 
`$18`
`text(Solution 1)`
`text(Sale price)`  `= 30  (25text(%) xx 30)` 
`=30  7.50`  
`= $22.50` 
`:.\ text(Final cost)`  `= 22.50  (20text(%) xx 22.50)` 
`= $18` 
`text{Solution 2 (advanced)}`
`text(Final cost)`  `= 30 xx 0.75 xx 0.8 ` 
`= $18` 
Jake bought a mobile phone at 25% off the original price.
The original price was $380.
How much did Jake pay for the mobile phone?
`$95`  `$285`  `$342`  `$355` 




`$285`
`text(Price of mobile)`  `=380  (text(25%) xx 380)` 
`=380  95`  
`=$285` 
`$7.50`
`text(Price of tent 1)`  `= 85  30text(%) xx 85 ` 
`= 85  25.5`  
`= $59.50`  
`text(Price of tent 2)`  `= 80  35text(%) xx 80` 
`= 80  28.0`  
`= $52.00` 
`:.\ text(Price difference)`  `= 59.5  52` 
`= $7.50` 
Walker is doing an intensive swim program over the summer holidays.
In his first session, he swims 50 laps.
In his second session, he swims 30% more laps than his first session.
In his third session, he swims 20% more laps than his second session.
How many laps does he swim at his third practice?
`78\ text(laps)`
`text(1st session) = 50\ text(laps)`
`text(2nd session)`  `= 50 + (30text(%) xx 50)` 
`= 50 + 15`  
`= 65\ text(laps)` 
`text(3rd session)`  `= 65 + (20text(%) xx 65)` 
`= 65 + 13`  
`= 78\ text(laps)` 
Ricky wants to buy a cricket bat that has a normal price of $160.
He is given a 10% discount.
What is the value of the discount?
`$1.60`  `$10`  `$16`  `$150` 




`$16`
`text(Value of the discount)`
`= 10 text(%) xx 160`
`=$16`
The table below lists the original price and the amount of discount of a pair of jeans at four different shops.
Which shop has the lowest sale price for the jeans?
`text(A)`  `text(B)`  `text(C)`  `text(D)` 




`text(Shop B)`
`text(Consider the sale price at each shop:)`
`text(A)`  `= 20  (25text{%} xx 20) = $15` 
`text(B)`  `= 21  (1/3 xx 21) = $14` 
`text(C)`  `= 18  (20 text{%} xx 18) = $14.40` 
`text(D)`  `= 17  2 = $15` 
`:.\ text(Shop B has the lowest sale price.)`
A box of golf balls normally cost $19.50.
During a sale, the golf shop took 10% off the regular price of the balls.
What is the new sale price of the golf balls?
$ 
`$17.55`
`text(10% discount)`  `= 19.50/10` 
`= $1.95` 
`:.\ text(Sale price)`  `= $19.50  $1.95` 
`= $17.55` 
Marty and Paul swam 3 km in an ocean swimming race.
Marty finished in a time of 1 hour and 10 minutes.
Paul took 25% longer than Marty.
Approximately how long did Paul take to finish the race?
`88\ text(minutes)`  `95\ text(minutes)`  `135\ text(minutes)`  `138\ text(minutes)` 




`88\ text(minutes)`
`text(Paul's time)`
`= (1\ text{hour and 10 minutes)} xx text(125%)`
`= 70 xx text(125%)`
`= 87.5\ text(minutes)`
`:.\ text(88 minutes is the closest choice.)`