 Hello and welcome to the session. In this session, we will discuss the following question and the question says, orangies cost $2 per dozen and mangoes cost $2 per dozen. Write a formula to find the total cost C in dollars of 20 oranges and 30 mangoes. Let's find the solution now. We are given that the cost of 1000 of oranges is A dollars. So cost of 12 oranges is equal to A dollars. This implies cost of 1 orange is equal to A upon 12 dollars. This implies of 20 oranges is equal to 20 A upon 12 dollars. This is equal to 5 A upon 3 dollars. We are also given that the cost of 1000 of mangoes is B dollars. So cost of 12 mangoes is equal to B dollars. This implies of 1 mango is equal to B upon 12 dollars. This implies cost of 13 mangoes is equal to 30 B upon 12 dollars which is equal to 5 B upon 2 dollars. Now we have to find a formula to find total cost C in dollars of 20 oranges and 30 mangoes. So according to the given statement, the formula is total cost C is equal to cost of 20 oranges which is 5 A upon 3 dollars cost as 13 mangoes which is 5 B upon 2 dollars. So this is the final answer. With this we end our session. Hope you enjoyed the session.