Please I need help with these questions I can't understand how to solve them.

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If the price index in a country were 100 for the year 2000 and 120 for 2003 and nominal gross domestic product in 2003 were $480 billion, then real gross domestic product for 2003 in 2000 dollars would be (A) about $360 billion. (B) about $380 billion. (C) about $400 billion. (D) about $600 billion. (E) indeterminate with the given information. GDP GDP Current or Price Deflator Price Deflator Nominal Index Index YEAR GDP (1990 = 100) (2000 = 100) 1990 $500 100 2000 $1,200 200 100 The value of the gross domestic product in 2000, in terms of 1990 prices, was (A) $600. (B) $700. (C) $1,000. (D) $1,200. (E) $1,300. If 2000 were made the base year for the GDP price deflator index, the value of the index number for 1990 (rounded to the nearest whole number) would be (A) zero. (B) 42. (C) 142. (D) 212. (E) 256