math
posted by mohamed .
Investing inhertance.Norman invested onehalf of his inheritance in a CD that had a 10% annoul yield. He lent onequarter of of his inheritance to his brother inlaw at 12% simple interest. His income from these two investments was $6400 for 1 year. How much was the inheritance?

.10(x/2) + .12(x/4) = 6400
x = 80,000