Let
x-----> the purchase price of the house
we know that
1) Marika paid
of the purchase price of the house with a loan
2) Marika paid the remaining
of the purchase price with her savings
3)
represent the
of the purchase price
so

Solve for x
Divide by
both sides


therefore
<u>the answer is</u>
the purchase price of the house is 
I think it's called a coordinate plane
Sorry if I'm wrong

so, you'd end up with a pyramid with a volume "one sixteenth" of the original then
now, the original had a volume of 1536, the quarterized version will then just be one sixteenth of that, or 1536 * 1/36
Living comfortably after you retire is the answer