PSLE Lee was given a fixed amount of allowance each month. In July, he saved $70 and spent the rest. In August, he saved 10% less and his spending increased by 20%. How much was Lee's allowance for each month?
|
Savings (%) |
Spending (u) |
Before
|
100% $70 |
100 u
|
Change |
- 10% |
+ 20 u |
After |
90% |
120 u |
100% of savings = 70
1% of savings = 70 ÷ 100 = 0.7
10% of savings = 10% x 70 = 7
10% of savings = 20 u of spending
20 u of spending = 7
1 u of spending = 7 ÷ 20 = 0.35
100 u of spending = 100 x 0.35 = 35
Lee's allowance for each month
= 100% of savings + 100 u of spending
= 70 + 35
= $105
Answer(s): $105