PSLE Sam was given a fixed amount of allowance each month. In February, he spent $290 and saved the rest. In March, he spent 20% more and his savings decreased by 10%. How much was Sam's allowance for each month?
|
Spending (%) |
Savings (u) |
Before |
100% $$(n80 |
100 u |
Change |
+ 20% |
- 10 u |
After |
120% |
90 u |
100% of spending = 290
1% of spending = 290 ÷ 100 = 2.9
20% of spending = 20% x 290 = 58
20% of spending = 10 u of savings
10 u of savings = 58
1 u of savings = 58 ÷ 10 = 5.8
100 u of savings = 100 x 5.8 = 580
Sam's allowance for each month
= 100% of spending + 100 u of savings
= 290 + 580
= $870
Answer(s): $870