Tommy spent $310 and saved the rest of his money. If he increased his spending by 30%, his savings would decrease by 31%. How much money did Tommy have?
| |
Spent (%) |
Saved (u) |
| Before |
100%
$310 |
100u |
| Change |
+ 30% |
- 31u |
| After |
130% |
69u |
Increase in spending = Decrease in savings
30% spending =
31u savings 100% spending = 310
1% spending = 310 ÷ 100 = 3.1
30% spending = 30 x 3.1 = 93
31 u savings = 931 u savings = 93 ÷ 31 = 3100 u savings = 100 x 3 = 300 Amount that Tommy had
= 310 + 300
= $610
Answer(s): $610
