Answer:
$824
Explanation:
We are given that Marge put money in her account=$800
She earns annual interest=3%
We have to find the amount she will have received at the end of the first year if no add any money
We are using the formula

Where r= Rate of interest
t=Time in years
P=principle
r=3%
P=$800
t=1 year
Using the formula and substitute the values
S.I=

S.I=$24
Amount =S.I+P
Amount=24+800=$824
Hence, She will have received money at the end of first year =$824