Question

Who has the better deal? How much less does each doughnut cost?

Answer 1

To determine which shop has the better deal, you have to determine the cost per donut for both shops.

Dunkin' Donuts

Sells 12 doughnuts for $10.00

To determine the price per unit you have to divide the total cost by the number of doughnuts

`(10)/(12)=0.83`

For this deal, each doughnut costs $0.83

Krispy Kreme

Sells 10 doughnuts for $7.00

To determine the price per unit you have to divide the total cost by the number of doughnuts

`(7)/(10)=0.7`

For this deal, each doughnut costs $0.70

→ The price per doughnut for Krispy Kreme is less than the price per doughnut for Dunkin' Donuts. This means that Krispy Kreme has a better deal.

To know how much does each doughnut cost, you have to calculate the difference between both unit prices:

`0.83-0.70=0.13`

The doughnuts at Krispy Kream cost $0.13 less.