Alejandro buys lunch for him and his friend for $20.50. He leaves a 15% tip and the sales tax is 6%. How much is the total cost of their lunch with
tax and tip included?
PLSS HELP! 30 POINTS

38+105= 143, 39+104=143, and you will find then adding the numbers on opposite sides, moving inwards yields the answer 138 every time. because of this, you’re going to multiply 138 times the number of pairs, which is 34. therefore, 34*138= 4692(i’m sorry if it’s the wrong numbers, but it’s the right concept)