AN ACT CONCERNING THE SALES PRICE THRESHOLD OF MOTOR VEHICLES SUBJECT TO A HIGHER SALES AND USE TAXES RATE AND LIMITING THE APPLICATION OF SAID RATE. To (1) increase to more than seventy-five thousand dollars the sales price threshold for a motor vehicle subject to the seven and three-fourths per cent sales and use taxes rate, and (2) limit the application of said rate to the portion of the sales price exceeding the threshold amount.