A husband and wife bought a house and signed a mortgage worth Rp. 500,000,000 which will be paid in installments every month for 15 years at an interest rate of j12 = 21%. After 5 years they renegotiate the contract and get an interest rate only 18%. Count : a. The amount of installments for the first 5 years b. The amount of installments after 5 years

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