7
AssignmentMultiple Select

Finite Geometric Series

Question 7 • Precalculus

Which expression can be used to find the salary, in thousands, for the second year? Select all that apply.

Answer
A
400 + (0.05)400
B
400 + (1.05)400
C
400(1.05)
D
(0.05)400 + (.05)400

Explanation

A 5% raise on a first-year salary of 400 thousand is 0.05 × 400 = 20 thousand. Adding the raise to the original salary gives 400 + (0.05)400, or equivalently multiplying by 1.05 gives 400(1.05) = 420 thousand. Choice B adds 105% of the salary to the original amount, and choice D adds two raises without including the original salary.

AI-written and checked against the verified answer.

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