Brainliest if correct!

on september 1, john owed $345.50 on his charge card.
during september, he made the following charges and
payments, and he returned two items for credit. find his
new balance at the end of the month.
9/3 charge $45.00
9/2 payment $65.00
9/7 charge 76.49
9/4 credit 14.00
9/24 charge 160.75
9/20 payment 34.79
9/27 charge 28.00
9/25 credit 16.40
finance charge 2.00

show how you got your answer.

Atextile fiber manufacturer is investigating a new drapery yarn, which the company claims has a mean thread elongation of 12 kilograms with a standard deviation of 0.5 kilograms. the company wishes to test the hypothesis upper h subscript 0 baseline colon mu equals 12 against upper h subscript 1 baseline colon mu less-than 12 using a random sample of n equals 4 specimens. calculate the p-value if the observed statistic is x overbar equals 11.8. round your final answer to five decimal places (e.g. 98.76543).