PSLE Sam was given a fixed amount of allowance each month. In January, he spent $490 and saved the rest. In February, he spent 40% 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 |
+ 40% |
- 20 u |
After |
140% |
80 u |
100% of spending = 490
1% of spending = 490 ÷ 100 = 4.9
40% of spending = 40% x 490 = 196
40% of spending = 20 u of savings
20 u of savings = 196
1 u of savings = 196 ÷ 20 = 9.8
100 u of savings = 100 x 9.8 = 980
Sam's allowance for each month
= 100% of spending + 100 u of savings
= 490 + 980
= $1470
Answer(s): $1470