Let's start with how much Robin earned. 35% of 43 is 15.05. Add those two together to get 58.05, which is how much Robin earned.
If you add 58 and 43 together, you get 101, which makes everything easier from now on. Subtract 101 from every answer and take 20% of it. Which gets closest to 43 is how much Jessica earned.
You actually have the right answer circled! Which is C!