Question 214049
.3x*.065+.3x*.07+.4x*.08=5,437.50
.0195x+.021x+.032x=5,437.50
.0725x=5,437.50
x=5,437.50/.0725
x=75,000 is the amount invested.
Proof:
.3*75,000*.065+.3*75,000*.07+.4*75,000*.08=5,437.50
1,462.5+1,575+2,400=5,437.5
5,437.5=5,437.5