There are infinitely many possible answers:0.27 + 0.28, 0.26 + 0.29, 0.25 + 0.3, and so on
0.18 + 0.18 + 0.19, 0.18 + 0.17 + 0.20, 0.18 + 0.16 + 0.21, etc
and then there are sums of four numbers, five numbers, six numbers, etc.
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0.275 + 0.275, 0.2749 + 0.2751, 0.27499 + 0.27501, and similar sums to 6 decimal places, 7 decimal places, and so on.
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Divide the mark-up amount as a decimal fraction of the pre-mark-up.
It is 0.2 when rounded to one decimal place
Nine quarters adds up to $2.25.
Look at the third decimal place. It is a 5, so it will round up the second decimal to give 0.69 as your answer.
Two decimal places for 0.0375 is 0.04. When rounding to two decimal places, we look at the third decimal place (in this case, 5) and round up if it is 5 or greater. In this instance, 5 is greater than 5, so we round up to 0.04.