smc-892-70-% increase/decrease

Number, NAP-K4-NC06 SA

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?

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`$2\ 241\ 000`

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`text(Discount)`	`= 10% xx 2\ 490\ 000`
	`= $249\ 000`

`:.\ text(Price)`	`= 2\ 490\ 000 – 249\ 000`
	`= $ 2\ 241\ 000`

Number, NAP-B4-NC27

A tennis racquet costs $95.

A tax of 10% is added to the price.

Which calculation will give the new price?

`95 + 10`	`95 + 0.1`	`95 xx 0.1`	`95 xx 1.1`

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`95 xx 1.1`

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`text(New price)`	`=95 + (10text{%} xx 95)`
	`=95 + 0.1 xx 95`
	`=95 xx 1.1`

Number, NAP-B4-CA15

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`

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`$285`

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`text(Price of mobile)`	`=380 – (text(25%) xx 380)`
	`=380 – 95`
	`=$285`

Number, NAP-H4-CA27

A dress was on sale with 25% discount.

As a regular customer, Kate received a further 10% on the already discounted price.

What was the overall percentage discount Kate received?

`text(2.5%)`	`text(12.5%)`	`text(27.5%)`	`text(32.5%)`	`text(35%)`

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`text(32.5%)`

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`text(Let the dress cost) = $100`

`text(C) text(ost after 25% discount) = $75`

`text(C) text(ost after another 10% discount)`

`= 75 – (10 text{%} xx 75)`

`= $67.50`

`:.\ text(Overall discount) = 32.5text(%)`

Number, NAP-I4-NC28 SA

Angus bought a tennis racket which cost $22.50 before the Goods and Services Tax (GST) was added.

How much did Angus' tennis racket cost after adding the 10% GST?

`$`

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`$24.75`

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`text(C)text(ost)`	`= 22.50 + 10text(%) xx 22.50`
	`= 22.50 + 2.25`
	`= $24.75`