Interest is defined as the amount of money paid for the use of someone else's money. An example of interest is the $20 that was earned this year on your savings account. An example of interest is the $2000 you paid in interest this year on your home loan.
I=PRT
I=interest
P=principal=amount you invested
The rate in decimal, don't forget to convert percent to decimal
T=time in YEARS (don't forget, 12 months per year)
5000 total
5000-4200=800
I=800
800=4200*r*4
800=16800*r
divide both sides by 16800
0.04761=r
4.761%=rate needed
6>4.7
Learn more about Interest here
https://brainly.com/question/2294792
#SPJ4