PSLE Tom was given a fixed amount of allowance each month. In September, he spent $60 and saved the rest. In October, he spent 20% more and his savings decreased by 10%. How much was Tom's allowance for each month?
|
Spending (%) |
Savings (u) |
Before |
100% $$(n80 |
100 u |
Change |
+ 20% |
- 10 u |
After |
120% |
90 u |
100% of spending = 60
1% of spending = 60 ÷ 100 = 0.6
20% of spending = 20% x 60 = 12
20% of spending = 10 u of savings
10 u of savings = 12
1 u of savings = 12 ÷ 10 = 1.2
100 u of savings = 100 x 1.2 = 120
Tom's allowance for each month
= 100% of spending + 100 u of savings
= 60 + 120
= $180
Answer(s): $180