Final answer:
James originally could do 12 burpees. With a 65% increase, he can now do 19.8 burpees. After rounding down to the nearest whole number, today he did 19 full burpees.
Step-by-step explanation:
Six months ago, James could only do 12 burpees in a minute. Today he did 65% more. To find how many full burpees James did today, we need to calculate an increase of 65% on his original 12 burpees. The calculation goes as follows:
Calculate 65% of 12 by converting the percentage to a decimal (0.65) and multiplying it by 12: 0.65 × 12 = 7.8.
Add this increase to the original number of burpees to find the new total: 12 + 7.8 = 19.8.
Since James can't do a fraction of a burpee, we round down to the nearest whole number, which gives us 19 full burpees.
Therefore, the correct answer is (a) 19 full burpees.