a lenten rs. 5000 to b for 2 years and rs. 3000 to c for 4 years on simple league with same rate of leigh and received rs. 1760 in all from they them as legage. the rate of leam annum is?
"нека курсът да бъде r % p . a . тогава , ( 5000 * r * 2 ) / 100 + ( 3000 * r * 4 ) / 100  1760 100 r + 120 r  1760 r  8 % отговор : e"
multiply(divide(1760, add(multiply(5000, 2), multiply(3000, 4))), const_100)