I need some help on figureing out how to answer these problems please i have never done this type of math before thank you

Question

Find the discount and total to be paid for each of the following:
Amount Terms When Paid Discount Total
$2.000 3/30 22 days
$400 2/10 5 days
$290.50 3/10, 2/30 12 days

Compute the following multiple discounts and net prices:
Lit price 550.65 First Discont 15%
Second Discount 5%

Find the markup and selling price for each of the following:
Cost Markup Rate Markup Selling Prce
$4,508.60 35%
$7005.72 52%

15. Find the markup percent, based on the cost, of an item that cost $49 and sells for $75

16. Find the markup amount of an item selling for $95 if it was marked up 30% based on the cost

Using the following figures to find the percent of recenue by division
East $43,000
West$61,000
South$28,000
Central$51,000

Calculate each deducation and (25.) net pay
Gross Wages Fed, tax 22.Insurance 23. St, Tax 24. FICA
608.45 57.20 1.7% 5% 7.65%

22.
23.
24.
25.

Answer 1

Find the discount and total...(I will do the last one)
$290.50 3/10, 2/30 12 days
means: there is a 3% discount if paid within 10, or a 2% discount if paid within 30 days.
They paid after 12 days, so they get a 2% discount.
So they have to pay 98% of original
Total = $290(.98) = $284.20

Compute the following multiple discounts....
discount of 15% , then 5%
single discount = 1 - .85(.95) = .1925 or 19.25%

Find the markup and selling price...
( I will do the 2nd one)
$7005.72 52%
amount of markup = 7005.72(.52) = 3642.97
Selling price = 7005.72 + 3642.97 = $10648.69

15. markup = 75-49 = 26
markup percent = 26/49 = .531 or 53.1%

16.
1.3(cost) = 95
cost = 95/1.3 = $73.08

Do not understand the remaining questions.