A friend of yours is interested in buying a new apartment and asked you to calculate for him the interest rate that the construction company is charging to finance the apartment. If the apartment is bought in cash, it will cost $ 180,000.00, if it is financed, your friend will have to pay a down payment of 30% of the property value and the debt balance in 12 monthly installments of $ 5,000.00 each, with a 3-month grace period. plus other18 monthly installments of R $ 7,000.00 each after the first 12 installments. (answer at a yearly rate)