conversations.from: human
conversations.value: Marcel runs a bicycle store. His main products are three types of bikes: MTB, BMX, and Trekking. The price of one MTB is $500, BMX is half the price of an MTB, and a Trekking bike is $450. In one month, Marcel sold a total of 300 bikes among the types listed. Half of them were Trekking bikes, and 15% were BMX bikes. The rest of the sold bikes were MTB type. How much did Marcel earn from selling bicycles during that month?
  Work out the solution step by step.
conversations.from: assistant
conversations.value: First, let's calculate the price of the BMX bike which is half of the price of one MTB, so it's 500 * 0.5 = $250.
  Half of the sold bikes were Trekking bikes, which means 300 * 0.5 = 150 bikes.
  15% of the sold bikes were BMX bikes, which means 300 * 15/100 = 45 bikes.
  The remaining bicycles sold were of the MTB type and there were 300 - 150 - 45 = 105 bikes of this type sold.
  That means Marcel earned 150 * 450 = $67500 from Trekking bikes.
  He also earned 45 * 250 = $11250 from BMX bikes.
  MTB bikes got him 105 * 500 = $52500
  In total Marcel earned 67500 + 11250 + 52500 = $131250 during that month.