[Anubhav Singh]

Firstly, calculating the cost price of the 600 quintals of rice:

Cost price of 1 quintal of rice = Rs 250

Therefore, the cost price of 600 quintals of rice = Rs 250 x 600 = Rs 1,50,000

Then calculating the total profit the grain merchant made:

Profit = 7% of cost price

therefore 7/100 x Rs 1,50,000 = Rs 10,500

To find the selling price of 600 quintals of rice, we need to add the profit and overhead charges to the cost price:

Selling price = cost price + profit + overhead charges

Overhead charges = Rs 1000

therefore the selling price would be Rs 1,50,000 + Rs 10,500 + Rs 1000 = Rs 1,61,500

Therefore, the total profit made by the grain merchant is Rs 10,500 and the selling price of 600 quintals of rice is Rs 1,61,500.

[Anubhav Singh]

To find the area of a trapezium, you need to use the formula: A = 1/2 × (a + b) × h, where a and b are the lengths of the parallel sides, and h is the distance between them.

In this case, a = 12 cm, b = 20 cm, and h = 15 cm.

So, substituting these values into the formula:

A = 1/2 × (12 + 20) × 15

A = 1/2 × 32 × 15

A = 240 cm²

Therefore, the area of the trapezium is 240 cm².