Excel公式，用于计算每天价格上涨的平均值

Question

Can some one help me with a simple forumla in excel for the following problem.

I need to be able to predict an average price for the month. For example, if the current price is $1000 and there are 5 days left until the end of the month, I believe the price will increase £50 p/day. 1050 then 1100 1150 etc So the average price for the last six days will be 1100?

i would like to be able to do a forumla that works it out from the current price, the increase amount and the days left with out having to have a cell for each day etc?

Is this possible? i have tried google but have come up with nothing, a difficult question to articulate.

Answer 1

Sounds like you're having troubles finding the days in the month and the percentage of the month that has already passed / left

To calculate the number of days in the current month use this formula

=EOMONTH(NOW(), 0)-EOMONTH(NOW(), -1)

To calculate the current day of the month use this formula

=DAY(NOW())

To calculate the percentage of the month already gone

=DAY(NOW()) / (EOMONTH(NOW(), 0)-EOMONTH(NOW(), -1))

To calculate the percentage of the month remaining

=1 - (DAY(NOW()) / (EOMONTH(NOW(), 0)-EOMONTH(NOW(), -1)))

Answer 2

I'm not clear what you are averaging - is it 5 days or 6?

If you start with 1000 and average 5 days then you are averaging 1000, 1050, 1100, 1150 and 1200 so the average is 1100 - if that's the required result try this formula

=A2+B2*(C2-1)/2

where A2 is price, B2 increase amount and C2 days left

If you are averaging 6 days then that starts at 1000 and ends at 1250 so average is 1125 and the formula should be:

=A2+B2*C2/2