MATHS PLZZ HELP PLZZ SOMEONE KINDA BEG YOU
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a wholesaler supplies 60 books while he was ordered to send 50 books by a retailer. a trade discount of 10 percent is also allowed. what is the net value of the discount to the retailer? Please help me with this question

i beg you 
helpneededstudent
Also with net discount I mean the answer in percent. Please can anyone help me!!!

MATHS PLZZ HELP PLZZ SOMEONE KINDA BEG YOU 
Reiny
Suppose that the cost of each of the origininal bools was $x per book
So the cost was 50x
He got a 10% discount, so the cost was (.9)50x
= 45x
but for 45x he actually got 60 books
so the cost of each book was only 45x/60
= 3x/4
As a percentage: (3x/4) / x
= 3/4 or 75%
which would be an effective discount of 25%
Illustration:
suppose he ordered 50 books at $12 each
cost would have been $600
but he got a 10% discount, so his cost would have been $540
But for $540 he got 60 books, so cost of each book
= $540/60 = $9.00
actual discount = $3.00
rate of discount = 3/12 = .25 = 25%
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a wholesaler supplies 60 books while he was ordered to send 50 books by a retailer. a trade discount of 10 percent is also allowed. what is the net value of the discount to the retailer? 
MATHS REINY
You had helped me with a similar question. This one says : A whole seller supplies 90 books while he was ordered to send 80 books by a retailer. If 15%trade discount was given, what was the net discount to the retailer? 
maths reiny help!!
You had helped me with a similar question. This one says : A whole seller supplies 90 books while he was ordered to send 80 books by a retailer. If 15%trade discount was given, what was the net discount to the retailer?