 Hello and welcome to the session. In this session, we will discuss the following question. And the question says, Robert paid $345.60 as sales tax on a purchase of $3850, Inclusive of sales tax. Find the rate of sales tax. Let's start the solution now. We are given that the total money paid including the sales tax is $3830. So total money paid including sales tax is equal to $3830. Also we are given that the sales tax is $345.60. So sales tax is equal to $335.60. Therefore, actual price is equal to the price including the sales tax that is $3840 minus the sales tax which is $345.60. This is equal to $3494.40. So we get sales tax paid on the actual price which is $3494.40 is equal to $345.60 which is given to us. This implies sales tax paid on $100 is equal to $345.60 upon $3494.40 into $100. Now the zero gates cancels and we remove the decimals. We now divide both the numerator and the denominator by 8. So the numerator becomes 432 and the denominator becomes 4368. Now dividing both numerator and denominator by 4 we get the numerator becomes 108 and the denominator becomes 1092. Again dividing the numerator and the denominator by 4 we get the numerator becomes 27 and the denominator becomes 273. Now dividing both numerator and denominator by 3 the numerator becomes 9 and the denominator becomes 91. So this is equal to 9 upon 91 into 100. This is equal to 9.89%. This is the rate of sales tax. Therefore rate of sales tax is equal to 9.89%. This is the final answer. With this we end our session. Hope you enjoyed the session.