PSLE Sam was given a fixed amount of allowance each month. In September, he spent $140 and saved the rest. In October, he spent 30% less and his savings increased by 20%. How much was Sam's allowance for each month?
|
Spending (%) |
Savings (u) |
Before
|
100% $140 |
100 u
|
Change |
- 30% |
+ 20 u |
After |
70% |
120 u |
100% of spending = 140
1% of spending = 140 ÷ 100 = 1.4
30% of spending = 30% x 140 = 42
30% of spending = 20 u of savings
20 u of savings = 42
1 u of savings = 42 ÷ 20 = 2.1
100 u of savings = 100 x 2.1 = 210
Sam's allowance for each month
= 100% of spending + 100 u of savings
= 140 + 210
= $350
Answer(s): $350