The cost price of a Rs.100 stock at 4 discount, when brokerage is 14% is :
CP. =Rs.100-4+14 = Rs.96.25
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The third proportional tox2-y2 and x-y is :
Let the third proportional to x2-y2 and x-y be z. Then,
x2-y2:x-y::x-y:z
=>x2-y2*z=x-y2
=> z=x-y2x2-y2=x-yx+y
What will be the value of 25.7322-15.7322
Can be easily solved with following formula
a2-b2=a-b×a+b = (25.732 - 15.732 ) x (25.732 + 15.732) =414.64