Question 83703
c=500x+(225000/x)
800=500x+(225000/x)

step 1: get rid of the x in the denominator by multiplying by x:
800x=500x+225000

step 2: get the all the x on one side of the equal side-subtract 500x from each side:
300x=225000

step 3: solve for x by dividing 300 from each side:
x=750---your answer!