Apply the compound interest formula:
A = P (1 + r/n )^nt
Where:
A = value of investment + interest
P = principal amount = $6,200
r= interest rate ( in decimal form) = 4.9/100 = 0.049
n= number of compounding periods
t= number of years
Replacing:
1 year = 12 months
11 months = 0.92 years
a. 11 months
A = 6,200 (1 + 0.049/12 ) ^ 12 x 0.92
A = 6,200 ( 1.004083333)^ 11
A = $6,484.24
b.For 6 years
A = 6,200 (1 + 0.049/12)^12 x 6
A = $8,314.08
