A wants to pay 100000e cash for a house. And 42000 in the end of every year 10 years forward. B wants to pay 150000e cash and 59000 in the end of 5 years forward. Which is a better payment for the seller if we count with an yearly intrest of 5% ??

Can anyone show me how to calculate it?

The answer to a is:424300

Anyone could show to me how to get this answer???