Question

Sally has a discount card that reduces the price of her grocery bill in a certain grocery store by 5%. If c represents the cost of Sally’s groceries, which expression represents Sally’s grocery bill?

Answer 1

`y=c-0.05 c`

Explanation:

Cost of Sally's groceries = c

Since she has a discount card of 5 %

So, She get discount on amount c =
`5\% * c`

=
`(5)/(100)c`

=
`0.05 c`

So, she will get a discount of amount 0.05 c.

So, amount she need to pay = c-0.05 c

Hence ,the expression represents Sally’s grocery bill 'y':
`y=c-0.05 c`

Answer 2

The original price is c.

discount of 5% => 5% less = c * 5 / 100 = 0.05c

Then the grocery bill will be: c - 0.05c = 0.95 c.

You can also say since the beggining that 5% disscount implies 0.95 factor, which leads to c * 0.95 = 0.95c.

Answer: 0.95c