Help With Math Problems!

Test Preparation
1

<p>1)How would you explain to your lab partner how to find the product of 7.5<em>10^16 and 2.0</em>10^4 and write the answer in proper scientific notation without using a calculator?</p>

<p>2)An item is sold by a manufacturer to a wholesaler for $10. THe wholesaler marks up the item 25% and sells it to a retail store. The retail storekeeper then marks up the item 50% of the wholesale price. What is the retail price of the item? What is the total markup percentage?</p>

<p>3)Debra is making a string of 92 beads for her great grandmother’s 92nd birthday. She is using six colors of beads:Read, Orange, Yellow, Green, Blue and Violet. The six colors are arranged in the repeating pattern shown below.</p>

<p>ROYGBVROYGBVROY</p>

<p>What will be the color of the last bead(92nd) on the string?</p>

<p>I know the all of the answers;however I cannot explain very well.
Could you guys help me?</p>

2

<ol>
<li> Since multiplication can be done in any order, the product is equal to
7.5 * 2.0 * 10^16 * 10^4 = 15.0 * 10^20 = 1.5 * 10^21, standard scientific notation.</li>
<li>A markup of 25% means multiply by 1.25. A markup of 50% means multiply by 1.5. Thus the retail price is 10 * 1.25 * 1.5 = 10 * 1.875 = $18.75 and the total markup is 87.5%.</li>
<li>Six goes into 92 fifteen times with two left over. So you have 15 complete sets of beads ROYGBV and two more, OY. So the last one is Y, yellow.
Agreed?</li>
</ol>