Tritium has a half-life of 12.4 years. If a sample contains 100 grams, how many grams (rounded to the nearest tenth of a gram) will be remaining in 50 years? ​

In 1995 america online had about 3000000 users over the next decade users are expected to increase from a few million to the tens of millions suppose the number of users increased by 150% by the year 2000 how many users will there be in the year 2000