PSLE Oliver was given a fixed amount of allowance each month. In July, he spent $50 and saved the rest. In August, he spent 30% less and his savings increased by 20%. How much was Oliver's allowance for each month?
|
Spending (%) |
Savings (u) |
Before
|
100% $50 |
100 u
|
Change |
- 30% |
+ 20 u |
After |
70% |
120 u |
100% of spending = 50
1% of spending = 50 ÷ 100 = 0.5
30% of spending = 30% x 50 = 15
30% of spending = 20 u of savings
20 u of savings = 15
1 u of savings = 15 ÷ 20 = 0.75
100 u of savings = 100 x 0.75 = 75
Oliver's allowance for each month
= 100% of spending + 100 u of savings
= 50 + 75
= $125
Answer(s): $125