The Dirt Doctor Fee is $150 and there is an additional charge of $100 per presentation to cover materials and preparation.
If you want to book the Dirt Doctor for 1 class presentation, the total cost would be calculated as follows:
$150 + $100 = $250
If you want to book the Dirt Doctor for 2 class presentations, the total cost would be calculated as follows:
$150 + 2 x $100 = $350
If you want to book the Dirt Doctor for 3 class presentations, the total cost would be calculated as follows:
$150 + 3 x $100 = $450