PSLE Mark was given a fixed amount of allowance each month. In August, he saved $370 and spent the rest. In September, he saved 10% less and his spending increased by 20%. How much was Mark's allowance for each month?
|
Savings (%) |
Spending (u) |
Before
|
100% $370 |
100 u
|
Change |
- 10% |
+ 20 u |
After |
90% |
120 u |
100% of savings = 370
1% of savings = 370 ÷ 100 = 3.7
10% of savings = 10% x 370 = 37
10% of savings = 20 u of spending
20 u of spending = 37
1 u of spending = 37 ÷ 20 = 1.85
100 u of spending = 100 x 1.85 = 185
Mark's allowance for each month
= 100% of savings + 100 u of spending
= 370 + 185
= $555
Answer(s): $555