 Hello and welcome to the session. In this session, we will discuss a question which says that what is the total cost of DVD player if regular price is $178 and sales tax is 5 and 1 by 2%? Now before starting the solution of this question, we should know a result. And that is, tax is equal to tax% that is t% into amount and total cost price is equal to cost price plus sales tax. Now these results will work out as a key idea for solving out the given question. Now let us start with the solution of the given question. Now in this question we have to find the total cost of the DVD player. Now it is given in the question that tax% that is t% is equal to 5 and 1 by 2% and cost of DVD player is equal to $178. Now this cost of DVD player will be the amount. So first of all we will find the tax using this formula. So here tax is equal to t% that is 5 and 1 by 2% into amount which is $178. Now 5 and 1 by 2% is equal to 11 by 2% which is further equal to 5.5%. Further this is equal to 5.5% into $178. Now this is equal to 5.5 upon 100 into $178 which is equal to now converting the decimal into fraction. This is equal to 55 upon 10 into 100 and this whole into $178. Now 5 into 2 is 10 and 5 into 11 is 55 also 2 into 89 is $178. So this is equal to 11 into 89 whole upon 100. Further this is equal to 979 upon 100 which is equal to 9.79. Therefore sales tax is equal to 9.79 dollars. Now we have to find the total cost price of the DVD player for this we will use the second result which is given as the key idea. Now cost price of DVD player is $178 and sales tax is equal to 9.79 dollars. So the total cost price of DVD player is equal to cost price of DVD player plus sales tax which is equal to $178 plus 9.79 dollars. So this is equal to $187.79. So the total cost of this DVD player is $187.79. And this is the solution of the given question. That's all for this session. Hope you all have enjoyed the session.