Suppose Harry receives a 5% increase in his weekly salary. If his weekly salary after the increase is $475, what was his old salary before the increase?

let the initial salary be x

so increase in salary = 5/100 * x = 0.05x

now its given that present salary after increement is 475

=> x + 0.05x = 475

=> 1.05x = 475

=> x=452.38(old salary)