A candy shop produces and sells three types of candy (fruit candy, chocolate candy and marshmallows). Considering that the shop's sales mix is the following one: for every 5 kg of fruit candy, 3.5 kg of chocolate candy and 1.5 kg of marshmallows are sold. The monthly operational cost of the candy shop is of 3,700 lei, while the production cost of 1 kg of fruit candy is of 30 lei, for 1 kg of chocolate candy it is of 40 lei and that of 1 kg of marshmallows is of 25 lei. Establish the monthly total breakeven quantity in kg of candy if the sales prices are: 45lei/kg for fruit candy, 50 lei/kg for chocolate candy and of 40 lei/kg for marshmallows. * (4 Points)