Question

please solve 4 and 5 problems

Answer 1

4)P=7,500
R=4%
T=3 Yrs
Compound interest formula =p(1+r/100)t,its p 1 + r by 100 t sq.
So,7500(1+4/100)3
     7,500(1+1/25)3
    7500(26/25)3
    7500*26/25*26/25*26/25,,,,, as its cube and not 3
    8436.48(simplified)
   so,8436.48 is amount and compoud intrest = a-p
   so,8436.48-7,500=936.48
so,the compound interest is 936.48

5)Simple iterest=PTR/100
p=30,000
r=7%
n=3 Yrs
so,30,000*7*3/100
therefor simple interest will be 6300
and compound interest

30000(1+7/100)3
30000(107/100)3
30000*107/100*107/100*107/100
96,300 simplified 
so,a-p
96,300-30,000=66,330

 but this you have to do by yourself