In a survey of 3005 adults ages 57 through 85 years it was found that 81.7% of them used at least one prescription medication. how many of the 3005 subjects used at least one prescription medication

So you have to figure out 81.7% of 3005.
3005 ÷ 2 = 1502.5 = 50%
3005 ÷ 5 = 601 = 20%
3005 ÷ 10 = 300.5 = 10%
3005 ÷ 100 = 30.05 = 1%
3005 ÷ 1000 = 3.005 = 0.1%
Then you just add
1502.5 + (601 + 300.5) + 30.05 + (3.005 x 7)
1502.5 + 901.5 + 30.05 + 21.035
= 2455.085 (the answer)
The answer above is if you have a calculator/if it's a calculator question