PSLE Sam was given a fixed amount of allowance each month. In June, he spent $420 and saved the rest. In July, 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 = 420
1% of spending = 420 ÷ 100 = 4.2
30% of spending = 30% x 420 = 126
30% of spending = 20 u of savings
20 u of savings = 126
1 u of savings = 126 ÷ 20 = 6.3
100 u of savings = 100 x 6.3 = 630
Sam's allowance for each month
= 100% of spending + 100 u of savings
= 420 + 630
= $1050
Answer(s): $1050