Answer: This investor has managed to earn 220/10 shares of his initial invention.
Step by step explanation:
Data for the fraction:
- An investor manages to win = 50/10
- During the second year you lose = 30/10
- In the third year he wins again = 200/10
In this problem we must apply the addition and subtraction of Fractions in order to obtain an answer about the parts of the initial investment that have been achieved. For this we pose the problem:

Rpt: This investor has managed to earn 220/10 shares of his initial invention.