PSLE Risa bought 2 fans of the same model at a sale. She paid $70.20 for them.
- What was the price of the fan before discount?
- Tim also bought 2 such fans at the price before discount. How much more did Tim pay than Risa?
|
Fan 1 |
Fan 2 |
Total |
Before |
100% |
100% |
200% |
Change (Discount) |
- 35% |
- 75% |
|
After |
65% |
25% |
90% |
(a)
Amount that Risa paid for the 2 fans in percent
= 65% + 25%
= 90%
90% → 70.20
1% → 70.20 ÷ 90 = 0.78
100% → 100 x 0.78 = $78
Price of the fan before discount = $78
(b)
Amount that Tim paid more than Risa
= 35% + 75%
= 110%
= 110 x 0.78
= $85.80
Answer(s): (a) $78; (b) $85.80