Question

ravish bought 100 articles for 4000 he sold 20 of them at a gain of 5% at what gain percent must be sell the remaining articles so as to gain 20% on the whole?

Answer 1

CP of 100 articels= 4000
 p%= 20%
SP= 120% of 4000=120*4000/100 = 4800
cp 0f 20 articels = 800
p% =5%
SP=105% OF 800= 840
SP OF 80  ARTICELS= 4800-840=3960
CP OF 80 PENS=3200
P=3960-3200= 760
P% = P/CP *100= 760*100/3200 =23.75%