Question

Shop A sells dress for & $79.50 with a 20% discount while shop B sells the same dress for $69.50 with a 10% discount. Write down a calculation you could do mentally to help you decide which shop to buy the dress from​

Answer 1

1. Let x be the real price for dress of shop A

20/100 ×x = 79.50

x = 79.50 ×100/20

x = 7950/20

x = $ 397.5

Real price of dress A is $397.5

So, discount of dress A =20%

$397.5-79.5$ = $318

2. Let x be the real price of dress B

10/100× x = 69.50$

x = $695

Real price of dress B is $695

So, discount of dress B = 10% =

$ 695 - 69.50 = $ 625.5

So buy dress from shop B as discount is more and rate is less