A man has a wife with six children and his total income in 1988 was $8500. He was allowed the following free of tax.
Personal=$1200
Wife=$300
Each child=$250 for a maximum of 4
Dependant Relatives=$400
Insurance=$250

The rest was taxed at the 10%
Calculate;
(i) His total allowed tax
(ii) his monthly taxable income (iii) his net monthly Pay
(iv) his income tax

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Me with this one question, and i'll upvote the brainliest answer

Can someone check if i did this correct. it’s number 4 if you’re wondering.

Afactory makes propeller drive shafts for ships. a quality assurance engineer at the factory needs to estimate the true mean length of the shafts. she randomly selects four drive shafts made at the factory, measures their lengths, and finds their sample mean to be 1000 mm. the lengths are known to follow a normal distribution whose standard deviation is 2 mm. calculate a 95% confidence interval for the true mean length of the shafts. input your answers for the margin of error, lower bound, and upper bound.