PSLE Tim was given a fixed amount of allowance each month. In July, he saved $390 and spent the rest. In August, he saved 10% more and his spending decreased by 30%. How much was Tim's allowance for each month?
|
Savings (%) |
Spending (u) |
Before |
100% $$(n80 |
100 u |
Change |
+ 10% |
- 30 u |
After |
110% |
70 u |
100% of savings = 390
1% of savings = 390 ÷ 100 = 3.9
10% of savings = 10% x 390 = 39
10% of savings = 30 u of spending
30 u of spending = 39
1 u of spending = 39 ÷ 30 = 1.3
100 u of spending = 100 x 1.3 = 130
Tim's allowance for each month
= 100% of savings + 100 u of spending
= 390 + 130
= $520
Answer(s): $520