PSLE Betty bought 2 fans of the same model at a sale. She paid $117.70 for them.
- What was the price of the fan before discount?
- George also bought 2 such fans at the price before discount. How much more did George pay than Betty?
|
Fan 1 |
Fan 2 |
Total |
Before |
100% |
100% |
200% |
Change (Discount) |
- 20% |
- 70% |
|
After |
80% |
30% |
110% |
(a)
Amount that Betty paid for the 2 fans in percent
= 80% + 30%
= 110%
110% → 117.70
1% → 117.70 ÷ 110 = 1.07
100% → 100 x 1.07 = $107
Price of the fan before discount = $107
(b)
Amount that George paid more than Betty
= 20% + 70%
= 90%
= 90 x 1.07
= $96.30
Answer(s): (a) $107; (b) $96.30