

Apply (a+b+c)2 =a2+b2+c2+2(ab+bc+ca) and put the values answer is 22.
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SP= 18400and 90% of SP = 16560. adding 20% profit 120% of CP = 16560. So CP = 13800.
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Chances of winning are opposite for A it is 7/12 and for B it is 5/12 so the probability of finding success
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a,b,c are in GP ,so b2=ac
Taking log both sides, log b2= log ac
2 log b= log a +log c, Hence log a,logb and logc are in AP
Let the number be x.
5x/4-4x/5=81
X=180