Please help me! I'm literally the worst at maths...
Reverse percentages question:
If, two years ago, David Coulthard had to pull all his Formula One earnings into a bank account and earned 5% compound interest, he would now have $7,938,000 in his account. How much did he earn two years ago?
Standard index form question:
A factory produces 3.6 x 10^6 nails each year. Each nail has a mass of 5 x 10^-3kg. Of all nails produced, 0.75% are faulty. Work out the total mass of all the faulty nails produced in one year.