Question

A merchant has 840kg of rice, part of which he sells at 9% profit and the rest at 16% profit. He must gain 12% profit on the whole. What is the quantity sold at 16% profit?

Answer 1

Answer:

360kg

Step-by-step explanation:

12% profit x 840= 100.8

9% x a + 16% x b = 100.8

a+b= 840

a=840-b

9% x (840-b) + 16% x b = 100.8

75.6-0.09b+0.16b=100.8

0.07b=25.2

b=360kg