Answer:
After 3 years Mac will have $992 in his account.
Explanation:
Principal amount deposited = $800
Time = 3 years
Rate of Interest = 6%
Now, SIMPLE INTEREST =

So, here S I =

or, Simple Interest on the principal amount = $192
Now, AMOUNT = PRINCIPAL + SIMPLE INTEREST
= $800 + $192
= $992
or, the Amount = $992
Hence, after 3 years Mac will have $992 in his account.