Question 285118
Andrew invested a total of P18,000, part at 5% and part at 9%. If his income for one year from the 9% investment was P100 less than his income from the 5% investment, how much was invested at each rate?
 with solution and answer plz


let him invest x at 5%

Interest obtained for 1 year will be 5/100  * x

He will invest 18000-x at9%

Interest obtained for 1 year will be (18000-x)*9/100

(18000-x)*9/100=5/100 *x -100

162000-9x /100  = 5x-10000 /100

162000-9x=5x-10000

14x= 172000

x=12285.7 @ 5%

 18000-12285.7=5714.3 at9%