This is a recursive formula, where the result of the first year is fed back into the formula to get the result for the second year and that back into the formula to get the result for the third year;
P=55000; a=listfor(t, 1, 3, (P =1.03*(P - 800))
Year 1 =55,826, Year 2 =56,677, Year 3 =57,553 - Population of the town 3 years from now.
