b) The housing and urban development institute offers savings and loan contracts for housing investment projects. The scheme of these contracts is based on a two-part system: A savings for several years and a subsequent loan with a fixed interest rate of 9% per year (on the part of the credit, not on the savings) the amounts of the contracts are in multiples of 1000000 dollars, is delivered at the end of the saving period. One of these plans from 1012 in which there will be a fixed monthly fee for 10 years and a loan is paid for 12 following years. Normally carry a 25% contract and the end of the savings was loaned 75%. The loan savings and payment instalments for the 12-day contract have already been calculated per million dollars and are as follows: Monthly savings fee: $2,417 Monthly loan payment fee: $8,540 What is the real interest rate that is paid for the credit of these contracts?. For savings take a return of 12% annually. b) The housing and urban development institute offers savings and loan contracts for housing investment projects. The scheme of these contracts is based on a two-part system: A savings for several years and a subsequent loan with a fixed interest rate of 9% per year (on the part of the credit, not on the savings) the amounts of the contracts are in multiples of 1000000 dollars, is delivered at the end of the saving period. One of these plans from 1012 in which there will be a fixed monthly fee for 10 years and a loan is paid for 12 following years. Normally carry a 25% contract and the end of the savings was loaned 75%. The loan savings and payment instalments for the 12-day contract have already been calculated per million dollars and are as follows: Monthly savings fee: $2,417 Monthly loan payment fee: $8,540 What is the real interest rate that is paid for the credit of these contracts?. For savings take a return of 12% annually