Answer:
Ans. The quarterly payment that the friend will make on the loan is $77,188.44
Explanation:
Hi, well, if they agreed to wait for 4 years to start to pay, it doesn´t mean that interest are not accumulating, therefore, $2,852,400 will accumulate interests for 4 years and the final balance will be the amount to use in order to find the equal quartely payments, but first, let´s convert this compunded interest rate into an effective rate, that is:

Ok, now let´s get back to the waiting period, that is 4 years, it means 16 quarters, so the present value in year 4 is:

Now, he has to pay for 19 years, that is 76 quarters, and the formula to use is as follows.

And we solve for "A"




Best of luck.