72,000
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mean = (sum of data items)/(number of data items) = (40,000 + 90,000 + 40,000 + 30,000 + 80,000)/5 = 280,000/5 = 56,000
example: 6789 to round it to the thousands would be 7000 example: 87634 to round to the ten-thousandths would be 90000
$900 = 90,000 pennies
600
I guess you mean 75% of 800 as the percent sign would have been removed as it causes difficulties with some browsers. percent means out of 100 → 75% = 75/100 → 75% of 800 = 75/100 × 800 = 600.