To a coin collector, the price of a gold coin is determined by the amount of gold in a coin, the market value of gold, and the demand of coin collectors. Say we are determining the value of a 1/2 oz. gold coin, where G(t) stands for the value, in dollars, of one ounce of gold t days after January 1st, and D(t) stands for the amount, in dollars, more than its value in gold a collector is willing to pay for a specific coin. Write down the function C(t), which gives the amount, in dollars, a coin collector would pay for a 1/2 oz. gold coin t days after January 1st. C(t)=

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