 
 <prompt> Wetin happun to di bimetallic standard? Based on di previous question, write a context wey contain di answer. E fit be 1 - 20 sentences. Context: <response>: The Gold Standard Act of 1900 waka comot di bimetallic standard and define di dollar as 23.22 grains (1.505 g) of gold, wey be say dem set di price of 1 troy ounce of gold at $20.67. Silver coins still dey circulate reach 1964, when all silver waka comot from dimes and quarters, and di half dollar reduce to 40% silver. Silver half dollars no dey circulate again from 1970. Gold coins dem collect by Executive Order 6102 wey Franklin Roosevelt issue for 1933. Di gold standard change to 13.71 grains (0.888 g), wey be say dem set di price of 1 troy ounce of gold at $35. Dis standard dey continue reach 1968. 