Since Marlon spent half of the gift card, then half of it which is $200/2 = $<<200/2=100>>100 remained on Monday.

Then on Tuesday, he spent $100/4 = $<<100/4=25>>25.

Therefore, he has $100 - $25 = $<<100-25=75>>75 left in his gift card.

# Answer

75
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Marlon has a gift card for $200. He spent half of it on Monday and one-fourth of the remainder on Tuesday. How much was left on his gift card?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
75
Marlon has a gift card for $200. He spent half of it on Monday and one-fourth of the remainder on Tuesday. How much was left on his gift card?
train