I need help understanding these badly! With everything I am trying to do this online homework and it's kicking my butt! Please help me understand them!

1: Assume the following four companies are used in computing an index (there have been no stock splits during this time).

Corporation	Shares Outstanding	Market Price (Base Period Jan. 1, 1977)	Market Price (Current Period Dec. 31, 2004)
Reese	4,000	$2	$14
Robinson	16,000	$8	22
Snider	6,000	$9	15
Hodges	40,000	$10	20

If the index is price-weighted, what will be the value of the index on Dec. 31, 2004? (Keep 0 decimal place)

2: Assume the following four companies are used in computing an index (there have been no stock splits during this time).

Corporation	Shares Outstanding	Market Price (Base Period Jan. 1, 1977)	Market Price (Current Period Dec. 31, 2004)
Reese	4,000	$2	$14
Robinson	16,000	$2	21
Snider	6,000	$9	15
Hodges	40,000	$10	20

If the index is value-weighted, what will be the value of the index on Dec. 31, 2004? (Keep 0 decimal place)

3: You buy 100 shares of stock at $40 per share on margin of 40%. If the price of the stock changes to $37 per share, what is your percentage gain in equity? Disregard interest costs. (Keep 4 decimal places)

4: An investor is in a 35% tax bracket for normal (ordinary) income. During the course of the year, he received $3,638 in dividends and had $3,892 capital gains on stock he had held for 19 months. How much will his total tax be on this investment-related income? (Keep 2 decimal places) asked me to edit but this is all the information we have been given.