If pascal invests 4000 pesos at 4% interest per year, how much additional money must he invest at 5.5% annual interest to ensure that the interest he receives each year is 4.5% of the total amount invested. (Use 2 variables) and check
Let x be amount invested at 5.5%, and y the total amount invested.
Let's construct the following table
Amount 4,000 Pesos x pesos y pesos
Interest 4% 5.5% 4.5%
Amount `4/100*4000` `5.5/100*x` `4.5/100*y`
If we add the amount of interest from the first two, we recieve the total amount, which is equal to the third column. Hence
Hence 2,000 pesos should be invested at 5.5%