if we put x = 1 directly in the epression above we will get an indeterminate form , so instead we will use l’hospital's rule.
take derivative of numerator and denominator separately and then apply the limit.
so now the expression becomes: by puttin x = 1 in the expression now we can find the solution
he would have to sale $500,000
9% of $500,000 is $45,000
so $30,000 plus $45,000 is $75,000