raman mixed 24 kg of butter at rs. 150 per kg with 36 kg butter at the rate of rs. 125 per kg. at what price per kg should he sell the mixture to make a profit of 40 % in the transaction?  Choose the correct choice from the following answers
A) rs . 135  B) rs . 162  C) rs . 189  D) rs . 198  E) none of these
<gadget id="calculator">24 * 150</gadget>
<output>3_600</output>

<gadget id="calculator">36 * 125</gadget>
<output>4_500</output>

<gadget id="calculator">3_600 + 4_500</gadget>
<output>8_100</output>

<gadget id="calculator">36 + 24</gadget>
<output>60</output>

<gadget id="calculator">8_100 / 60</gadget>
<output>135</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">135 * (2/5)</gadget>
<output>54</output>

<gadget id="calculator">135 + 54</gadget>
<output>189</output>

<result>C</result>
raman mixed 24 kg of butter at rs. 150 per kg with 36 kg butter at the rate of rs. 125 per kg. at what price per kg should he sell the mixture to make a profit of 40 % in the transaction?
add(divide(add(multiply(24, 150), multiply(36, 125)), add(36, 24)), multiply(divide(add(multiply(24, 150), multiply(36, 125)), add(36, 24)), divide(40, const_100)))
cp per kg of mixture = [ 24 ( 150 ) + 36 ( 125 ) ] / ( 24 + 36 ) = rs . 135 sp = cp [ ( 100 + profit % ) / 100 ] = 135 * [ ( 100 + 40 ) / 100 ] = rs . 189 . answer : c