Margaret is certain that every time she parks in the garage it costs her at least $1.90. if the garage charges 40 cents plus 30 cents for each half hour. how long is margaret car parked?

She was parked 2 1/2 hrs 

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)