Today (April 28), platinum closed at $1,012 per troy ounce,
and gold closed at $1,243 the ounce.
1 troy ounce = 31.1 grams.
So 100g of platinum would be worth (100/31.1) x $1,012 = $3,254
and 100g of gold would be worth (100/31.1) x $1,243 = $$3,997 (rounded).