Brainiest if correct or first
90 with a 20% increase

90.00 increased by 20% is 108.00

The increase is 18.00

Your answer is: it increased by 18

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)