Question 1034389
Our equation for interest is I=P(r) where I is the interest,P is the principal, and r is the rate of interest. Solving for P:
I=P(r)
P=I/r
So
1200/r=4200/r+10
1200r+12000=4200r
3000r=12000
r=4
r+10=14!!!!!!!!!