A sheet is in the form of a rhombus whose diagonals are 10 m and 8 m.

1.	A sheet is in the form of a rhombus whose diagonals are 10 m and 8 m. The cost of painting both of its surfaces at the rate of Rs 70 per m2 is (a) Rs 5600 (b) Rs 4000 (c) Rs 2800 (d) Rs 2000
Answer» (a) Rs 5600. Cost of painting both its surfaces = 2 × 70 × Area of one surface = Rs \(\bigg(2\times70\times\frac12\times10\times8\bigg)\) = Rs 5600.

A sheet is in the form of a rhombus whose diagonals are 10 m and 8 m. The cost of painting both of its surfaces at the rate of Rs 70 per m2 is (a) Rs 5600 (b) Rs 4000 (c) Rs 2800 (d) Rs 2000

Answer»

(a) Rs 5600.

Cost of painting both its surfaces

= 2 × 70 × Area of one surface

= Rs \(\bigg(2\times70\times\frac12\times10\times8\bigg)\) = Rs 5600.