A factory checks 0.5% of a batch of 1200 bolts by hand. Enter the number of bolts checked.

الشرح

Half of 1% of 1200 is half of 12, so 0.5% of 1200 is 6 bolts. Using 0.5 x 1200 = 600 treats 0.5% as 50%, a hundredfold error.