about half a dollar
nothing
8 is the answer . Since half a kg is 500g, 100 g would cost 1/5 as much. 1/5 of 40 is 8.
Half as much which is 1.25
Three times a half-life is equivalent to one and a half full life cycles of a substance. In terms of decay, after three half-lives, only one-eighth of the original amount remains. This is because each half-life reduces the amount by half, so after three halvings (1/2, 1/4, 1/8), the remaining quantity is 1/8 of the initial amount.
A half-life means half the original matter decays and is gone after that period. Something with a 3 hour half-live will have only 1/2 its amount left after 3 hours. After 6 hours, only 1/4th is left, and after 9 hours, only 1/8th is left. After one half-life, half is gone. Half is left. After another half-life, half of the remaining half is gone, leaving one quarter left. After the third half-life, half of the quarter is gone and half of that quarter remains, which is an eighth of the original.
Half life is pretty much self explanatory in that after they go through 1 half life half of the radioactive decay remains. 1/2 x 1/2 x 1/2 = 1/8 = 0.125 = 12.5% or you can divide 100% by 2, 3 times and you'll get 12.5%
1/8 amount of the element will reamain. After 1 half-life there is 1/2 left After the 2nd half-life there is 1/2 of 1/2 left which is 1/4 After the 3rd half-life there is 1/2 of 1/4 left which is 1/8
$5.50................................................!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!1
1/4. After 27 days, half of the material will have decayed. After another 27 days half of the remaining material will have decayed. Half of half is 1/4.
After 10 days, 1/2 of the original isotope will remain since its half-life is 5 days. This means 6kg of the original isotope will remain after 1 half-life, which remains the same after 10 days since another half-life has passed.
If you pay $1.20 for two pounds of candy, how much would you pay for half a pound?