First question: interest rate is 5% annually. After 4 years relative value of interest will be 1.05^4 Now we multiply that with starting funds and get 4000* 1.05^4 = 4862.03
Second question: Because interest is 8% semiannually that means that after 35 years relative value of interest will be 1.04^(35*2) 6000*1.04^70 = 93,429.71
Third question: after first year tractor's value will be 0.86*15450. After 3 years its value will be: (0.86)^3*15,450 = 9,827.07
