Question

Help me Please:

Maritza brought 8 doughnuts of the same price and received less than $15.00 change from a $20.00 bill. What is the minimum cost of 1 doughnut? Round your answer to the nearest cent.

Answer 1

Hello, Daniel!
Wow! Those doughnuts sound expensive!

Subtracting $15 from $20 results in $5, the absolute minimum of what our friend Maritza could have spent (since she received "less than $15" in change.

Answer 2

The first approach that comes to mind would be to net d represent the cost of a donut.

Then I'd write an inequality involving d, 8 (the number of doughnuts purchased), and $5 (the absolute minimum that Maritza could have spent):

8d>$5.00

Can you solve this for d?

Answer 3

It would be d>0.625

Answer 4

But how do i round it to the nearest cent @mathmale ?

Answer 5

You have $0.625. Look at the third digit after the decimal point. If this digit is 5 or greater, you are to round up. Less than 5, you are to round down. The result will be accurate to the nearest 1 cent.

Rounding off appropriately, $0.625 becomes ... what ???

Answer 6

0.63 ?

Answer 7

2.50$

Answer 8

Daniel, yes. 0.63. But please do include the $ sign: $0.63.

Answer 9

oh yeah now i see

Answer 10

it is 0.63$ your right mathmale

Answer 11

Ok

Answer 12

Dan: supposing our dear friend Maritza buys 8 donuts at $0.63. How much must she pay, total?

Answer 13

$5.04

Answer 14

right. And supposing Maritza forks over $20 in payment. What should she expect to receive in change?

Answer 15

14.96 ?

Answer 16

Right. (But please be sure to include that $ sign.)

Help me Please:

Maritza brought 8 doughnuts of the same price and received less than $15.00 change from a $20.00 bill.

is $14.96 less than $15.00?

Answer 17

Yes

Answer 18

So, what do you think? Have we solved this problem correctly?
Any questions?

Answer 19

Yes... Would you please help me with the other problem
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