PSLE Ryan was given a fixed amount of allowance each month. In September, he spent $10 and saved the rest. In October, he spent 30% less and his savings increased by 10%. How much was Ryan's allowance for each month?
|
Spending (%) |
Savings (u) |
Before
|
100% $10 |
100 u
|
Change |
- 30% |
+ 10 u |
After |
70% |
110 u |
100% of spending = 10
1% of spending = 10 ÷ 100 = 0.1
30% of spending = 30% x 10 = 3
30% of spending = 10 u of savings
10 u of savings = 3
1 u of savings = 3 ÷ 10 = 0.3
100 u of savings = 100 x 0.3 = 30
Ryan's allowance for each month
= 100% of spending + 100 u of savings
= 10 + 30
= $40
Answer(s): $40