1) A radioactive substance decays at a rate proportional to theamount of the substance at present time. Initially 200 grams of athe substance was present and remain 80% of the initial amountafter 2 hours.
A.) Determine the amount of the substance remaining after 10hours (counted in grams)
B.) Determine the time that 60% of the initial amount of thesubstance has decayed (counted in hours)
