Can anyone help me with this chemistry problem?

In 1933, the United States abandoned the gold standard internationally, and price The Gold rose $ 20 to $ 35 per ounce troy The gold coin known as the $ 20 eagle weighed two ounces and 33,436 gold was 90% by mass. A) What was the value of the golden eagle two before and after the price change? B) How many coins could be made as from 50 per troy ounce of gold?

1 oz troy = 31.103 g *** *** A piece of 1 x (33.436 g of the alloy / 1 each) x (0.90 g gold / 1 g of alloy) x (1 troy ounce gold / 31.103 grams gold) x ($ 20 / 1 troy ounce) = $ 19.35 x 1 piece (33,436 g of the alloy / 1 each) x (0.90 g gold / 1 g of alloy) x (1 ounce troy gold / 31.103 grams of gold) x ($ 35 / 1 troy ounce) = $ 33.86 *** B *** x 50 troy ounces (31.103 grams of gold / 1 troy ounce gold) x (1 g of the alloy / 0,90 grams of gold) x (1 piece / 33.436 g of alloy) = 51.7 if it could be to 51 pieces with a little more to the left

2008 SP70 $50 Gold Eagle Coin

★ MINT ★ 2012 1 OZ $50 GOLD EAGLE ★ GEM PROOF COPY COIN ★ $5.95

★ MINT ★ 2012 1 OZ $50 GOLD EAGLE ★ GEM PROOF COPY COIN ★ $14.95

1986 United States American Eagle 1 oz $50 Gold Coin $1,800.00

★ 2009 $50 AMERICAN GOLD EAGLE ★ COPY COIN ★ GEM PROOF ★ GET THEM WHILE U CAN $5.95

5x ★ 2009 $50 AMERICAN GOLD EAGLE ★ COPY COIN ★ GEM PROOF ★ GET THEM WHILE U CAN $19.95

50x ★ 2009 $50 AMERICAN GOLD EAGLE ★ COPY COIN ★ PROOF ★ GET THEM WHILE U CAN $149.95

10x ★ 2011 $50 AMERICAN GOLD EAGLE ★ COPY COIN ★ PROOF ★ GET THEM WHILE U CAN $24.95

50x ★ 2011 $50 AMERICAN GOLD EAGLE ★ COPY COIN ★ PROOF ★ GET THEM WHILE U CAN $149.95

★ 2012 $50 AMERICAN GOLD EAGLE ★ COPY COIN ★ PROOF ★ GET THEM WHILE U CAN $5.95

10x ★ 2012 $50 AMERICAN GOLD EAGLE ★ COPY COIN ★ PROOF ★ GET THEM WHILE U CAN $24.95

★ 2011 $50 AMERICAN GOLD EAGLE ★ COPY COIN ★ PROOF ★ GET THEM WHILE U CAN $5.95

100x ★ 2011 $50 AMERICAN GOLD EAGLE ★ COPY COIN ★ PROOF ★ GET THEM WHILE U CAN $249.95

5x ★ 2011 $50 AMERICAN GOLD EAGLE ★ COPY COIN ★ PROOF ★ GET THEM WHILE U CAN $19.95

10x ★ 2009 $50 AMERICAN GOLD EAGLE ★ COPY COIN ★ PROOF ★ GET THEM WHILE U CAN $24.95

100x ★ 2009 $50 AMERICAN GOLD EAGLE ★ COPY COIN ★ PROOF ★ GET THEM WHILE U CAN $249.95