Solution:
a. APR
First of all we have to find the interest rate, as we know the present value and future value.
Using the future value equation: FV = PV(1+r)
$4.20 = $3.20(1+r)
1+r = 4.2/3.2
r = 1.3125 - 1
r = 0.3125
r = 31.25% per week
The interest rate per week is 31.25%. To find the APR we have to multiply this rate with number of weeks in a year
APR = (52) 31.25% = 1,625%
APR = 1,625%
we know that for calculating EAR:
EAR = [1+ (APR/m)]^m - 1
Here m = number of weeks
EAR = [ 1 + (1,625/52)]^52 - 1
EAR = [ 1 + 0.3125]^52 - 1
EAR = 138,408,967.22 - 1
EAR = 138,408,966.22% (approximately)
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