Question 283830
Let the amount invested at 7% = x
Then the amount invested at 8^ = x-100
Total interest is
           x*(7/100)+(x-100)*(8/100)= 58
           7x+8x-800 = 5800
           15x = 6600
             x = 6600/15
             x = 440
Total amount invested = x+x-100
=2x-100
=2*440-100
=780