please help this questions price index with steps and answer, thanks

According to the following table, calculate the simple composite price index of 2021 by choosing 2019 as the base year. Year Pork Chicken 2019 $72.0 $110.0 $45.0 2020 $76.5 $120.5 $51.5 2021 $93.0 $155.5 $65.0 (A) 110.44 (B) 139.56 1 (C) 140.31 (D) 168.53 | In time series components, the is the most appropriate to tiescribe stock prices, sales, employment and other business and economic series. (A) Seasonal Variation (B) Irregular Variation 1 (C) Cyclical Variation (D) Trend |