IMPORTANT FACTS
Cost Price:
The price, at which an article is purchased, is called its cost price, abbreviated as C.P.
Selling Price:
The price, at which an article is sold, is called its selling prices, abbreviated as S.P.
Profit or Gain:
If S.P. is greater than C.P., the seller is said to have a profit or gain.
Loss:
If S.P. is less than C.P., the seller is said to have incurred a loss.
IMPORTANT FORMULAE
Gain = (S.P.) - (C.P.)
Loss = (C.P.) - (S.P.)
Loss or gain is always reckoned on C.P.
Gain Percentage: (Gain %)
Gain % =(Gain x 100/C.P).
Loss Percentage: (Loss %)
Loss % =((Loss x 100)/C.P.)
Selling Price: (S.P.)
SP =((100 + Gain %) /100x C.P)
Selling Price: (S.P.)
SP =((100 - Loss %)/100x C.P).
Cost Price: (C.P.)
C.P. =(100/(100 + Gain %)x S.P).
Cost Price: (C.P.)
C.P. =(100/(100 - Loss %)x S.P).
If an article is sold at a gain of say 35%, then S.P. = 135% of C.P.
If an article is sold at a loss of say, 35% then S.P. = 65% of C.P.
When a person sells two similar items, one at a gain of say x%, and the other at a loss of x%, then the seller always incurs a loss given by:
Loss % =(Common Loss and Gain %/10)2=(x/10)2 .
If a trader professes to sell his goods at cost price, but uses false weights, then
Gain % =(Error/(True Value) - (Error)x 100) %.
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