Brianne saves $10 in January. Each month, she saves twice as much as her previous month's savings. How much will she save in May?
Thoughts? Step-by-step reasoning:
Brianne saves $10 x 2 = $20 in February. She will save $20 x 2 = $40 in March. She will save $40 x 2 = $80 in April. Therefore, she will save $80 x 2 = $160 in May.
Thus, the answer is 160.