PSLE Sam was given a fixed amount of allowance each month. In August, he spent $350 and saved the rest. In September, he spent 30% more and his savings decreased by 20%. How much was Sam's allowance for each month?
|
Spending (%) |
Savings (u) |
Before |
100% $$(n80 |
100 u |
Change |
+ 30% |
- 20 u |
After |
130% |
80 u |
100% of spending = 350
1% of spending = 350 ÷ 100 = 3.5
30% of spending = 30% x 350 = 105
30% of spending = 20 u of savings
20 u of savings = 105
1 u of savings = 105 ÷ 20 = 5.25
100 u of savings = 100 x 5.25 = 525
Sam's allowance for each month
= 100% of spending + 100 u of savings
= 350 + 525
= $875
Answer(s): $875