How to use fractions and decimals to calculate the answer?

Question

Ava was playing a game online. She had a great first round and the second round she increased her point total by 25%. On the third round she decreased her point total by 3/5. She had a great fourth round increasing her total points by 75%. On the fifth and final round she lost 2/7 of her total ending the game with 50 points. How many points did Ava have at the end of round one?

Answer 1

end with 50

start with 80

add 25%

subtract 60%

add 75%

subtract 2/7

leaves 50

80 +25% = 100

100 -60% = .4(100) =40

40+75% = 1.75(40) = 70

70 - 2/7 = (5/7)70 = 50

end of Round One score was 80

Round Two 100

Round Three 40

Round Four 70

Round Five 50