Question

during 1 year the population of village increased by 5 percent and during the next year it diminished by 5 percent if at the end of the second year the population was 798 what was it at the beginning of first year.?

Answer 1

let population be x
So , After 1 year , population is = x+ ( x ×5/100)
= 105x/100
after 1 year , population is = 105x/100 - ( 105x/100 × 5/100) = 399x/400
So , 399x/400 = 798
x = 800