=If my total is increased by 31% to a total of $991.00, How much did I start with?
let X= amount started with
x+(x*31%) = $991.00
x+ (x* 0.31)=991
x+ 0.31x = 991
1.31x = 991
x= 991/1.31
x=756.488549 rounded to $756.49 is amount started with
check
756.49 +(756.49*31%)=991.00
756.49 + (756.49 * 0.31)=991.00
756.49 + 234.51= 991.00
991=991