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canuckclint
- Master | Next Rank: 500 Posts
- Posts: 154
- Joined: Tue Aug 26, 2008 12:59 pm
- Location: Canada
- Thanked: 4 times
wow. what a big picture!!!
Generall, 4me this is more logical Q than arithmetic
Main Q: find the average amount of $ on the account of 30 days
To answer this you should know
(summ of the amounts on each day)/30 days
Initailly - 600$
credited - 300$
So ypu need to know only on what days the pyment was credited.
(1)
payment was on 21st day
so you have 600$ on 20 days and 10 days on remaining 10 days
you can easy find the average
SUFF
(2)
the average of 25 days is 540$
this means tat payment was already credited
so (25*540 + 5*300)/30 = average
SUFF
D
