Final answer:
The store's return on assets is 1.5 percent.
Step-by-step explanation:
To calculate the store's return on assets, we need to divide its net profit by its total assets and multiply by 100 to express it as a percentage.
Net profit = $42,000
Total assets = $2,800,000
Return on Assets = (Net Profit / Total Assets) * 100
Return on Assets = ($42,000 / $2,800,000) * 100 = 1.5%
Therefore, the store's return on assets is 1.5 percent (option a).