Let's calculate how much money Diego has in his checking account at the end of the day on Friday step-by-step.
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Starting balance on Wednesday: $204.30
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Deposits and withdrawals on Thursday:
- Deposit: $87.21
- Withdrawal: $50.99
New balance on Thursday: \[ 204.30 + 87.21 - 50.99 = 240.52 \]
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Moving money to savings account on Friday:
- Amount moved: \( \frac{1}{4} \) of the checking account balance.
First, calculate \( \frac{1}{4} \) of $240.52: \[ \frac{1}{4} \times 240.52 = 60.13 \]
Now, subtract this amount from the checking account balance to find the ending balance: \[ 240.52 - 60.13 = 180.39 \]
Therefore, the amount of money in Diego's checking account at the end of the day Friday is $180.39.
Thus, the correct answer is C. $180.39.