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David has a job selling mobile phone plans. His weekly salary, `W` dollars, is calculated using the rule below:
`W = 300 + 0.05 P`
where `P` is the total value in dollars of the mobile phone plans he sells that week.
David sold $32 000 worth of mobile phone plans in a given week.
What was David's salary in the week?
`C`
| `W` | `= 300 + 0.05 xx 32\ 000` |
| `= 300 + 1600` | |
| `= 1900` |
`=>C`
A salesman earns $200 per week plus $40 commission for each item he sells.
How many items does he need to sell to earn a total of $2640 in two weeks?
`B`
`text(Let items sold) = n`
`text{Wages over 2 weeks}\ (w)`
`= (2 xx 200) + 40n`
`= 400 + 40n`
`text(Find)\ n\ text(when)\ w = 2640:`
| `2640` | `= 400 + 40n` |
| `40n` | `= 2240` |
| `n` | `= 56` |
`=> B`
Jane sells jewellery. Her commission is based on a sliding scale of 6% on the first $2000 of her sales, 3.5% on the next $1000, and 2% thereafter.
What is Jane’s commission when her total sales are $5670?
`B`
`text(Commission)`
`= (2000 xx text(6%)) + (1000 xx text(3.5%)) + (5670-3000) xx text(2%)`
`= (2000 xx 0.06) + (1000 xx 0.035) + (2670 xx 0.02)`
`= 120 + 35 + 53.40`
`= 208.40`
`=> B`