Peter mixed 24 kg of butter at $150 per kg with 36 kg butter at the rate of $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 options:
A) $156
B) $177
C) $189
D) $190
E) $153
$189   $189   $189P per kg of mixture = [24(150) + 36(125)]/(24 + 36) = $135   SP = $189P[(100 + profit%)/100]   = 135 * [(100 + 40)/100] = $189.135 *  (100 + 40)/100= 
<gadget id="calculator">135 *  (100 + 40)/100</gadget>
<output>189</output>
$189.
<result>C</result>
Peter mixed 24 kg of butter at $150 per kg with 36 kg butter at the rate of $125 per kg. At what price per kg should he sell the mixture to make a profit of 40% in the transaction?