The answer is 2,800.
To estimate the product of 2 numbers, you round to the nearest ten or hundred. In this case, you would round 73 to 70, and 403 to 400, to make it easy to multiply.
70 x 400 = 2,800
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18.11%
842 multiplied by 403 is 339,326.
44
645 multiplied by 73 is 47,085.
Their average is 22 and their difference is 9 so use 22 and 9 13*31 = 222 - 92 = 484 - 81 = 403