# Differences between calculations.

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Registered Posts: 3 New contributor 🐸
edited March 20
I had an example question regarding labour hours which had 5% unproductive hours. So the total hours would need to include an additional 5%.
Can someone explain the difference between doing:
5700 * 1.05 (which equals 5985)
and
5700 * 100 / 95 (which equals 6000).
The second way is the correct way but I can't understand why there is a difference.

• Registered Posts: 410 Dedicated contributor 🦉
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Pass.
• Registered Posts: 410 Dedicated contributor 🦉
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I think the 5% would need to be taken off.
Are you sure the second one isn’t 5700/100 then times by 95.
• Registered Posts: 3 New contributor 🐸
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I have added a screenshot from the AAT results.
• Registered Posts: 3 New contributor 🐸
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So I think my confusion was because I was working out 5% of a figure (for 5% wastage) but I should've been working out 5% of the total figure, including the wastage. The questions have changed on the green light test but I have re-done this section this morning using this way of calculating it (i.e. figure / 100 * 95) and have got 100% correct.
• Registered Posts: 410 Dedicated contributor 🦉
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If you are doing the area which I think u are, there were no questions on wastafe. Management techniques? If not, pardon me.