Problema Solution
K has a total of $1000 to invest.She puts part of it in an account paying 4% interest per year and the rest in a bond paying 6.5% interest. If she has $50 in simple interest at the end of one year, how much was invested at each rate?
One aluminum alloy is 35% aluminum.Another aluminum is 55% aluminum. How much of each should be used to make 1000g of aluminum alloy that is 40% aluminum?
Answer provided by our tutors
4% interest: x
6.5% interest: y
So
x+y=1000
4%x + 6.5%y = 50
So
x=600
y=400
So
4% interest: $600
6.5% interest: $400