A person bought some articles at the rate of 5 per rupee and the same number at the rate of 4 per rupee. He mixed both the types and sold at the rate of 9 for 2 rupees. In this business he suffered a loss of ₹ 3. The total number of articles bought by him was:

1080

             Quantity                  Price

                5 × 4                   1 × 4  (bought same number of article)

                4 × 5                   1 × 5

            -----------              ------------

CP           40 × 9                  9 × 9

SP           9 × 40                  2 × 40  (make quantity equal)

            ------------            -------------

               360                      1 R (loss) → 3

                 ↓ x3

            1080 article