Find the percentage change in price in each of the following examples using the mid-point method. Instructions: Round your answers to two decimal places. If you are entering a negative number be sure to include a negative sign (-) in front of that number.
a. The price of a $4 sandwich increases to $5: percent
b. A sale discounts the price of a sofa from $750 to $500: percent

Rolston music company is considering the sale of a new sound board used in recording studios. the new board would sell for $27,200, and the company expects to sell 1,570 per year. the company currently sells 2,070 units of its existing model per year. if the new model is introduced, sales of the existing model will fall to 1,890 units per year. the old board retails for $23,100. variable costs are 57 percent of sales, depreciation on the equipment to produce the new board will be $1,520,000 per year, and fixed costs are $1,420,000 per year. if the tax rate is 35 percent, what is the annual ocf for the project?