a baseball card decreased in value 25 % in its first year and 10 % in its second year. what was the total percent decrease of the card ' s value over the two years?  Select the correct option:
A) 28 %  B) 30 %  C) 32.5 %  D) 36 %  E) 72 %
<gadget id="calculator">10 / 100</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">1 - (1/10)</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">25 / 100</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 - (1/4)</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(9/10) * (3/4)</gadget>
<output>27/40 = around 0.675</output>

<gadget id="calculator">(27/40) * 100</gadget>
<output>135/2 = around 67.5</output>

<gadget id="calculator">100 - (135/2)</gadget>
<output>65/2 = around 32.5</output>

<result>C</result>
a baseball card decreased in value 25 % in its first year and 10 % in its second year. what was the total percent decrease of the card ' s value over the two years?
subtract(const_100, multiply(multiply(subtract(const_1, divide(10, const_100)), subtract(const_1, divide(25, const_100))), const_100))
"let the initial value of baseball card = 100 after first year , value of baseball card = ( 1 - 25 / 100 ) * 100 = 75 after second year , value of baseball card = ( 1 - 10 / 100 ) * 75 = 67.5 total percent decrease of the card ' s value over the two years = ( 100 - 67.5 ) / 100 * 100 % = 31.5 % answer c"