<p>pg 176 (10th editon)</p>
<li><p>A retailer buys a radio from the wholesaler for $75.00. He then marks up the price by 1/3 and sells it at a discount of 20%. What was his profit on the radio (to the nearest cent)?
A.$ 5.00
B.$ 6.67
C.$ 7.50
D.$ 10.00
E.$ 13.33</p></li>
<li><p>IF the radius of a circle is increased by 50%, what will be the percent increase n the circumferene of the circle?</p></li>
</ol>
<p>A. 25%
B. 50%
C. 100%
D. 150%
E. 225%</p>
<li>A store usuall sells a certain item at 40%profit. One week the store has a sale, during which the item is sold for 10% less than the usual price. During the sale, what is the percent profit of the sotre makes on each of these items.</li>
</ol>
<p>A. 4%
b. 14%
C. 26%
D. 30%
E. 36%</p>
<p>Thank you.</p>
<p>Can you give me a thorough explanation of these 3 questions. They give the answers and solutions on page 186 but I am still lost.</p>