`person(1)` has `YEAR_PERCENT_MORE`% more money today than `he(1)` did this time last year. If `person(1)` has $`YEAR_THIS` today, how much money did `he(1)` make over this past year? (Round to the nearest cent, or hundredth of a dollar.)

`round((YEAR_THIS - YEAR_LAST) * 100) / 100`

Let `x`

be the amount of money that `he(1)` had last year.

`x + `

`YEAR_PERCENT_MORE / 100`x = $`YEAR_THIS`

`(100 + YEAR_PERCENT_MORE) / 100`x = $`YEAR_THIS`

`x = \frac{$`

`YEAR_THIS`}{`(100 + YEAR_PERCENT_MORE) / 100`}

`x = $`

(rounding to the nearest penny in this step)`YEAR_LAST`

So, `he(1)` had $`YEAR_LAST` last year, but we want to know how much `he(1)` has made **over the past year!**

`\text{money made over the past year} = \text{amount of money today} - \text{amount of money last year}`

`\qquad =$`

`YEAR_THIS`-$`YEAR_LAST`

`\qquad \approx $`

`round((YEAR_THIS - YEAR_LAST) * 100) / 100`

So, the answer is $`round((YEAR_THIS - YEAR_LAST) * 100) / 100`.

`person(1)` has $`DOLLARS` to spend at a store. The store currently has a sale where the sale price is `PERCENT_OFF`% off the marked price. What is the highest marked price that `person(1)` can afford? (Round to the nearest cent, or hundredth of a dollar.)

`HIGHEST_PRICE`

Let `x`

be the highest marked price that `person(1)` can afford.

`x-`

`(PERCENT_OFF/100)`x = \text{sale price} = \text{amount `person( 1 )` has to spend}

`((100-PERCENT_OFF)/100)`x = $`DOLLARS`

`x = $`

`HIGHEST_PRICE`