80% of Vanessa's amount was $112 more than Pierre's amount. When Vanessa spent 60% of her amount and Pierre spent 30% of his amount, they had the same amount of amount left. Find the amount that Pierre had at first.

	80% of Vanessa's amount	Vanessa's amount	Pierre's amount
Before	28 u	35 u	20 u
Change		- 21 u (- 60%)	- 6 u (- 30%)
After		14 u	14 u

Percentage of Vanessa's amount left
= 100% - 60%
= 40%

Percentage of Pierre's amount left
= 100% - 30%
= 70%

40% = ⁴⁰₁₀₀ = ²₅
70% = ⁷⁰₁₀₀ = ⁷₁₀

The amounts of amount that Vanessa and Pierre had left were the same.
Make the numerators the same.

²₅ of Vanessa's amount = ⁷₁₀ of Pierre's amount
¹⁴₃₅ of Vanessa's amount = ¹⁴₂₀ of Pierre's amount

Amount that Vanessa had = 35 u

80% of the amount that Vanessa had
= 35 u x 80%
= 35 u x ⁸⁰₁₀₀
= 28 u

Difference between 80% of Vanessa's amount and Pierre's amount
= 28 u - 20 u 
= 8 u

8 u = 112
1 u = 112 ÷ 8 = 14

Amount that Pierre had at first
= 20 u
= 20 x 14
= $280

Answer(s): $280