Explanation
M.P =800 Rs (given) First Dis.=10% S.P. after first dis.=800-(800\times\dfrac{10}{100})=720 Rs Second Dis.=5% S.P. after second Dis.= 720-(720\times\dfrac{5}{100})=684 Rs Third Dis.=3% S.P. after third Dis.= 684-(684\times\dfrac{3}{100})=663.48 Rs S.P. is Rs 663.48
C.P. = Rs. 840
Gain =10\%
S.P. =\dfrac{100+\text {gain percentage}}{100}\times C.P
S.P. =\dfrac{100+10}{100}\times 840
\Rightarrow \dfrac{110}{100}\times 840= Rs. 924
Selling price of the shopkeeper is the cost price of the new buyer.
Then C.P. = Rs. 924
Loss =5\%
S.P. =\dfrac{100-\text {loss percentage}}{100}\times C.P.
S.P =\dfrac{100-5}{100}\times 924
\Rightarrow \dfrac{95}{100}\times 924= Rs. 877.80
Hence, final S.P. =Rs. 877.80
Let the printed price of item be Rs. 100.
After discount of 10\% SP = Rs. 90 profit earned = 15\% C.P of item = \dfrac{100}{115}\times 90 = \dfrac{1800}{23} Hence, CP : Printed Price = \dfrac{1800}{23}:100 = 18:23
Let the C.P. of the article be Rs. x.
Then, S.P. = Rs. \dfrac {x\times (100-20)}{100}
\Rightarrow 480=\dfrac {x\times 80}{100}
\Rightarrow x=\dfrac{480\times 100}{80} \Rightarrow x= Rs. 600 \therefore S.P. at 20 \% profit = Rs. \dfrac {600\times (100+20)}{100} =\dfrac {600\times 120}{ 100 }= Rs. 720
Given, M.P. = Rs. 17940, Discount =8\%
S.P. = M.P. - Discount
S.P =17940-8\% of M.P.
\Rightarrow 17940-\dfrac{8}{100}\times 17940
\Rightarrow 17940-1435.20= Rs. 16504.80
Let the C.P. of the article = Rs. 100. Then, M.P. of the article = Rs. 100 + Rs. 20 = Rs. 120 Rate of Discount = 5\% \therefore Discount offered = 5\% of M.P. =\dfrac {5}{100}\times Rs. 120= Rs. 6 \therefore S.P. = M.P. - Discount = Rs. 120 - Rs. 6 = Rs. 114
\text {Profit} = S.P. - CP. = Rs. 114 - Rs. 100 = Rs. 14 Profit \%= \dfrac {14}{100}\times100 = 14 \%
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