If $4200 is invested in savings account for which interest is compounded semianually, and if the $4200 turns into $4900 in 4 years , what is the interest rate of the savings account

A=final amount

P=initial amount invested

r=rate in decimal form

n=number of times compounded per year

t=time in years

given

A=4900

P=4200

r=r (we are solving for this)

n=semianually=2 times per year

t=4

find r

divide both sides by 4200

take 8th root of both sides

minus 1

multiply both sides by 2

r=0.038911

r=3.891% so about 3.89%

step-by-step explanation:

try remembering the steps