PSLE Oliver was given a fixed amount of allowance each month. In September, he saved $320 and spent the rest. In October, he saved 10% more and his spending decreased by 40%. How much was Oliver's allowance for each month?
|
Savings (%) |
Spending (u) |
Before |
100% $$(n80 |
100 u |
Change |
+ 10% |
- 40 u |
After |
110% |
60 u |
100% of savings = 320
1% of savings = 320 ÷ 100 = 3.2
10% of savings = 10% x 320 = 32
10% of savings = 40 u of spending
40 u of spending = 32
1 u of spending = 32 ÷ 40 = 0.8
100 u of spending = 100 x 0.8 = 80
Oliver's allowance for each month
= 100% of savings + 100 u of spending
= 320 + 80
= $400
Answer(s): $400