If the original mass of an element, in grams, is a whole number and the element has decayed by exactly 91 percent in some time period, which of the following could be the final mass of that element?  Choose the correct choice from the following choices:
A) 36 grams B) 28 grams C) 29 grams D) 31 grams E) 32 grams
Let original mass be 100   The final mass of that element will be 9   So whatever option we have it will be divisible by 9   Check for the options the one that doesn't produce non terminating decimal is our answer   A. 36 grams   36/9= 
<gadget id="calculator">36/9</gadget>
<output>4</output>
4   B. 28 grams   28/9= 3.111.....   C. 29 grams   29/9 = 3.222.......   D. 31 grams   31/9 = 3.444.....   E. 32 grams   32/9 = 3.555..   36 gramsnswer (36 grams)
<result>A</result>
If the original mass of an element, in grams, is a whole number and the element has decayed by exactly 91 percent in some time period, which of the following could be the final mass of that element?