Given
A = 1000(1.03)t
With the above equation, the initial deposit is $1000 and the interest rate on said deposit is 3%.
I am assuming that the above equation is a compounding interest where t is an exponent. t represents time period in years.
Let us assume t is 5.
A = 1,000(1.03)^5 = 1,000(1.159) = 1,159.00
After 5 years, the $1,000 deposit will earn an interest of $159 for a total of $1,159.