Answer: a
Step-by-step explanation: edge 23
The sum = 50 + 50 * 1.04 + 50 * 1.04²
= 50 * 1.04⁰ + 50 * 1.04 + 50 * 1.04²
Which is agree with ∑ 50 (1.04)^(n-1)
The correct answer is the first picture.
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