GRB Ltd has several product lines with a manager in charge of each product line. The managers are paid a bonus based on the net income generated by their product line. Rubica (the CEO of GRB Ltd) was going through the financial reports of the 2nd quarter of 2021 to analyse the performance of the product lines. For 'Sweets' one of the largest product lines of GRB Ltd, Rubica noted that while the sales declined from $800,000 in quarter 1 to $600,000 in quarter 2, the product line manager of Sweets received a bonus larger than the 1st quarter. The manager of Sweets division was eligible for a higher bonus due to an operating profit increase from $90,000 in the 1st quarter to $120,000 in the 2nd quarter. Rubica wondered how the product line manager was entitled to a higher bonus with a decline in sales. Rubica also wants to know how net income increased with a decline in sales. Rubica found the following data from the financial reports of 'Sweets': 

Particulars Quarter 2 Quarter 1 Units sold (at $20 selling price) 30,000 40,000 Variable production cost per unit $8 $8 Fixed production costs $200,000 $200,000 Fixed selling and administration expenses $140,000 $140,000 Budgeted production (units) 40,000 40,000 Actual production 50,000 30,000 Opening stock of finished goods 0 10,000 GRB Ltd maintained a policy that any production volume variance would be written off to the cost of goods sold in the quarter in which it occurs. Required: (a) As a cost analysis expert, you are required to prepare the income statements for the first and second quarters of 2021, based on which the product line manager of 'Sweets' was entitled to a higher bonus with the decline in sales. 

Provide an explanation with supporting calculations as to why the net income increased with a decline in sales. (b) Suggest an alternative method of calculating operating profit wherein the operating profit will not increase with a decrease in sales. 

Prepare the income statements for the first and second quarters of 2021 based on the alternative you propose.