Mr. Rahim has some money to invest.He can either invest in a business of selling mangoes or deposit the money in 'XYZ' bank.In the business,the selling price of four mangoes equal the purchase price of five mangoes. On the other hand,in the bank he can invest the money at a 13% simple rate per annum. Which option should he take? (You must support your answer through stepwise calculation of profitability)