A trader sold 250 articles for $525,000.00 at a profit of 25%. a. Calculate the cost of each article.
b. If the trader had wanted 45% profit on the cost price then how much would he sell the articles?

The area (a) of a circle with a radius of r is given by the formula and its diameter (d) is given by d=2r. arrange the equations in the correct sequence to rewrite the formula for diameter in terms of the area of the circle.