PSLE Carl was given a fixed amount of allowance each month. In September, he spent $210 and saved the rest. In October, he spent 20% less and his savings increased by 10%. How much was Carl's allowance for each month?
|
Spending (%) |
Savings (u) |
Before
|
100% $210 |
100 u
|
Change |
- 20% |
+ 10 u |
After |
80% |
110 u |
100% of spending = 210
1% of spending = 210 ÷ 100 = 2.1
20% of spending = 20% x 210 = 42
20% of spending = 10 u of savings
10 u of savings = 42
1 u of savings = 42 ÷ 10 = 4.2
100 u of savings = 100 x 4.2 = 420
Carl's allowance for each month
= 100% of spending + 100 u of savings
= 210 + 420
= $630
Answer(s): $630