A multivitamin tablet contains $0.14 \mathrm{~g}$ of vitamin C. How much vitamin C does a bottle of 60 tablets contain? Write your answer in milligrams.

Step 1 ：Convert the amount of vitamin C in one tablet from grams to milligrams. We know that 1 gram is equal to 1000 milligrams. So, 0.14 grams is equal to \(0.14 \times 1000 = 140\) milligrams.

Step 2 ：Multiply the amount of vitamin C in one tablet (in milligrams) by the number of tablets: \(140 \, \text{mg/tablet} \times 60 \, \text{tablets} = 8400 \, \text{mg}\).

Step 3 ：\(\boxed{8400 \, \text{mg}}\) is the total amount of vitamin C in the bottle.