PSLE Pierre was given a fixed amount of allowance each month. In April, he saved $20 and spent the rest. In May, he saved 20% less and his spending increased by 10%. How much was Pierre's allowance for each month?
|
Savings (%) |
Spending (u) |
Before
|
100% $20 |
100 u
|
Change |
- 20% |
+ 10 u |
After |
80% |
110 u |
100% of savings = 20
1% of savings = 20 ÷ 100 = 0.2
20% of savings = 20% x 20 = 4
20% of savings = 10 u of spending
10 u of spending = 4
1 u of spending = 4 ÷ 10 = 0.4
100 u of spending = 100 x 0.4 = 40
Pierre's allowance for each month
= 100% of savings + 100 u of spending
= 20 + 40
= $60
Answer(s): $60