The table shows the profit of the companies if no bonuses were issued.
After working out what 2.1% of Company 1's profit and 4.9% of Company 2's profit is, subtract them from the combined profit (add the profits of company 1 and 2 from the table) they would have recieved if it wasn't for the bonuses.
This number is the new combined profit for both company, with the bonuses taken into account.
Profit = Revenue - Costs
Substitute the new combined profit and the combined revenue (700,000, given), and you'll be able to determine the combined cost incurred.