Daily Challenge 249 - Incremental Changes

Implement an algorithm which increases number and returns the result. Start from number and increment by step as many times as iterations demands.
Input: number, iterations, step.

Example:
alg(2, 5, 10) => 2 + 10 + 10 + 10 + 10 + 10 = 52
alg(17, 3, 6) => 17 + 6 + 6 + 6 = 35

Tests:
alg(100, 5, 50)
alg(14, 20, 4)

Good luck!

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