Answer:
Step-by-step explanation:
A) The dealer bought Birr 8000 at 7% tax.
Total amount to be paid = cost price (1 + r%)
r = 7% = 0.07
Total amount to be paid 
B) To find the VAT, it is the difference between the tax paid when the good was bought and the tax put on it after it was sold.
Tax paid when the shoes were bought = 7% of cost price

Tax paid when the shoes were sold = 9% of selling price

VAT = tax recovered on sale - Tax paid on purchase

0.000576 is the right awnser
For 4 you just need to multiply the 7 and 33 together and add 32. Then put your awnser over 33. (if it is asking for the fraction)
199.
the z score for the 90th percentile is 1.28, so you can solve the equation

which gets you the 199