# Math Help - Compound interest at changing interest rates

1. ## Compound interest at changing interest rates

A young couple owns a block of land worth $29000. They are offered 20% deposit and 2 equal payments of$15000 at the end of years 2 and 4. If money is worth J2=8% for the first 2 years and J4=12% for the next 2 years, should they accept the offer?

I tried [2*(15000)*(1.04^-4)(1.03^-8)]+(29000*.2) answer comes out to 26043.71 so they should not accept, but i think ive skipped some things and done something wrong, the answer in the back says they shouldnt accept but i think i still messed up somehow. Any help is appreciated thanks, teerplid.

2. PV = $29,000x20% +$15,000(1+8%)^-2 + $15,000(1+12%)^-4 PV =$5,800 + $15,000(0.85734) + 15,000(0.635518) PV =$5,800 + $12,860.08 +$9,532.77
PV = $27,192.85 3. Originally Posted by dexteronline PV =$29,000x20% + $15,000(1+8%)^-2 +$15,000(1+12%)^-4
PV = $5,800 +$15,000(0.85734) + 15,000(0.635518)
PV = $5,800 +$12,860.08 + $9,532.77 PV =$27,192.85
Not quite; the 2nd \$15,000 needs to be discounted at both rates; this way:

PV = .20(29000) + 15,000(1.08^-2) + 15,000(1.12^-2)(1.08^-2) = 28912.06