Answer the question on the basis of the following information: Only three goods are produced in an economy in the following amounts: A = 10, B = 30, C = 5. The current year per unit prices of these three goods are A = $2, B = $3, and C = $1.

(Advanced analysis) Refer to the information. If the per unit prices of the three goods were each $1 in a base year used to construct a GDP price index, then the GDP price index in the current year is: