The equation for the problem is x(1+r)^t
X is the original deposit
R is the rate or percentage of growth
T is the time, in years
X=1800
R=.06
T= 6
F(x)=1800(1+.06)^6
=1800(1.06)^6
=1800(1.41852)
=2533.3344
The above is the future value of the money, to find out how much was gained by interest just subtract the original investment of 1800
2533.3344-1800=753.3344
So the answer is B