If money is invested at r percent interest, compounded annually, the amount…

If money is invested at r percent interest, compounded annually, the amount of the investment will double in approximately 60/r years. If Pat's parents invested $7,000 in a long-term bond that pays 6 percent interest, compounded annually, what will be the approximate total amount of the investment 20 years later, when Pat is ready for college?

This problem repeats another one in the library (at most with different numbers), so it's left out of browsing.

AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #78533