After sales tax, a $90 lamp cost $95.40. What is the sales tax percentage?

96 students attend the Chess Club every Wednesday.

800 is 100% of the population. We simply multiply 12% to the population of 800 to get its value.

800 x 12% = 96 students

To check: divide 96 by 800 to get its percentage.

96 / 800 = 0.12 x 100% = 12%

96 students is equivalent to 12% of 800, the school's total population.