The following values represent advertising rates paid by a regional catalog retailer that advertises either on radio or in newspapers:

Year Radio Rates ($) Newspaper Rates ($)

1 300 400 2 310 420 3 330 460 4 346 520 5 362 580 6 380 640 7 496 660 Determine a relative index for each type of advertisement using year 1 as the base year.