PSLE Ian was given a fixed amount of allowance each month. In August, he saved $60 and spent the rest. In September, he saved 20% more and his spending decreased by 40%. How much was Ian's allowance for each month?
|
Savings (%) |
Spending (u) |
Before |
100% $$(n80 |
100 u |
Change |
+ 20% |
- 40 u |
After |
120% |
60 u |
100% of savings = 60
1% of savings = 60 ÷ 100 = 0.6
20% of savings = 20% x 60 = 12
20% of savings = 40 u of spending
40 u of spending = 12
1 u of spending = 12 ÷ 40 = 0.3
100 u of spending = 100 x 0.3 = 30
Ian's allowance for each month
= 100% of savings + 100 u of spending
= 60 + 30
= $90
Answer(s): $90