An investor bought 3 oversized lots in order to subdivide. he paid $40,000 for the lots. after subdividing, the investor was able to sell each lot for $18,000. excluding commissions and closing costs, what per cent profit did the investor realize?

Alocal hamburger shop sold a combined total of 601 hamburgers and cheeseburgers on friday. there were 51 more cheeseburgers sold than hamburgers. how many hamburgers were sold on friday? a local hamburger shop sold a combined total of hamburgers and cheeseburgers on friday. there were more cheeseburgers sold than hamburgers. how many hamburgers were sold on friday?