Maha Bodhi Sch 2007 PSLE Math Prelim Q42

During a sale, a departmental store offered a storewide discount of a certain fixed percentage. Mrs Goh paid for $16 for a dress during the sale and saved $4.
a) What is the percentage discount?
b) How much did Mrs Goh save if she paid $20 for her purchases during the sale?

Solution

a)
Saved ----- $4
Price before discount ----- $4 + $16 = $20
Percentage discount ----- ($4 / $20) x 100% = 20% (Answer)

b)
Price at 80% ----- $20 (after 20% discounted)
10% ----- $20 divided by 8 = $2.50
20% discount ----- $2.50 x 2 = $5

Answer: She saved $5