Everest, Inc. produces and sells three products $($Cars$,$ Trucks, and Vans$)$ for $$50,000$ each.

Cars produce the lowest contribution margin ratio $(10\%),$ trucks produce the highest $(30\%),$ and vans are in$-$between $(20\%).$ Everest has monthly fixed expenses of $$750,000$ and desires to make a monthly profit of $$100,000.$ Typically, Everest sells its three products in equal proportion. If a prudent sales manager can shift the sales mix to $10\%$ cars, $60\%$ trucks and $30\%$ vans, how many fewer sales units are needed to reach the monthly target profit?