Juan borrows a total of $78,000 to pay for medical school. He borrows part of the money from the school whereby he will pay 4.6% simple interest. He borrows the rest of the money through a government grant that will charge him 6.5% interest. In both cases, he is not required to pay off the principal or interest during his 4 years of medical school. However, at the end of 4 years, he will owe a total of $16,062 for the interest from both loans. How much did he borrow from each source?​