PSLE Peter was given a fixed amount of allowance each month. In June, he spent $390 and saved the rest. In July, he spent 40% more and his savings decreased by 30%. How much was Peter's allowance for each month?
|
Spending (%) |
Savings (u) |
Before |
100% $$(n80 |
100 u |
Change |
+ 40% |
- 30 u |
After |
140% |
70 u |
100% of spending = 390
1% of spending = 390 ÷ 100 = 3.9
40% of spending = 40% x 390 = 156
40% of spending = 30 u of savings
30 u of savings = 156
1 u of savings = 156 ÷ 30 = 5.2
100 u of savings = 100 x 5.2 = 520
Peter's allowance for each month
= 100% of spending + 100 u of savings
= 390 + 520
= $910
Answer(s): $910