Consider the question. Sasha made 30 chocolate muffins for her school bake sale fundraiser. Melissa made 4 times as many muffins as Sasha, and Tiffany made half of Sasha and Melissa's total number of muffins. If one muffin sold for $4, how much money did Sasha, Melissa, and Tiffany contribute to the fundraiser?
 What is the step-by-step reasoning process to arrive at the answer: 900?
Melissa made 30 x 4 = 120 muffins. Together, Melissa and Sasha made 30 + 120 = 150 muffins. Tiffany made 150 / 2 = 75 muffins. Altogether, they made 150 + 75 = 225 muffins. They contributed 225 x $4 = $900 to the fundraiser.