I need help with this question please

Assume an economy that is producing only one product. Output and price data for a three-year period are as follows. Answer the question on the basis of these data. Units of Price Per Year Output Unit 20 $4 25 A W N 30 6 Refer to the data. If year 2 is chosen as the base year, real GDP for year 1 is: ( 1) $25. ( 2) $100. ( 3) $20. ( 4) $80