Kavya has Rs 60. A chocolate costs Rs 2, and the shop gives 1 free chocolate for every 4 empty wrappers returned. She spends all her money on chocolates and eats every chocolate she gets. Wrappers of free chocolates can be exchanged too, and leftover wrappers can be combined with new ones, but she cannot borrow chocolates or wrappers. What is the maximum number of chocolates she can eat?
37
39
38
40
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