The answer is $9.75. Let's present 1/10 as percentage: 1/10 = (1*10)/(10*10) = 10/100 = 10%. Now, $97.50 is 100%. x is 10%. Make the proportion: $97.50 : 100% = x : 10%. Cross the products: 100% * x = $97.50 * 10%. Find x: 100 * x = $975.00. x = $975.00 / 100. x = $9.75.