16x5=80 cause if it bounces 16 times 5 times then
Answer: 
Step-by-step explanation:
For this exercise you must use the followinG Trigonometric Identity:

In this case, given the right triangle PQR, you can identify that:

Then, the next step is to substitute those values into
:

And the final step is to solve for "QR" in order to find its value.
So you get that this is:

What is that $13,455.78? Something? I did this and got $13,122.76. Here's how I did it:
Use this formula

where A is the ending amount, P is the starting amount, n is the number of times it compounds a year, and t is the number of years. We have all we need to set it up:

First divide and add inside the parenthesis:

then multiply the exponents:

raise the value inside the parenthesis to the power of 260:

and finally multiply to get A = $13,122.76