For the first week, her investment gain is $400 * 25% = $<<400*25*.01=100>>100.

This leaves her investment with a value of $400 + $100 = $<<400+100=500>>500.

For the second week, her investment increased by $500 * 50% = $<<500*50*.01=250>>250.

Pima's investment in Ethereum is now worth a total of $500 + $250 = $<<500+250=750>>750.

# Answer

750
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
Pima invested $400 in Ethereum. In the first week, it gained 25% in value. In the second week, it gained an additional 50% on top of the previous gain. How much is her investment worth now?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
750
Pima invested $400 in Ethereum. In the first week, it gained 25% in value. In the second week, it gained an additional 50% on top of the previous gain. How much is her investment worth now?
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