A sensor records 0.48 units per minute for 1.5 minutes. Enter the total number of units recorded.

Explication

0.48 x 1.5: multiply 48 by 15 to get 720, then place three decimal places from the factors, giving 0.72 after dropping the trailing zero. The wrong answer 7.2 places the point two positions too far right, ignoring two of the three contributed places.