Using proportions, the expression for the final amount is:
150(1+d).
A proportion is a fraction of a total amount, and the measures are related using a rule of three.
For this problem, we have that:
Hence the equivalent expression is:
120 x 1.25 x (1 + d) = 150(1+d).
More can be learned about proportions at https://brainly.com/question/24372153
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