How do I provide a realistic Estimate the Terminal Value (TV) at year 5 was based on the 'arithmetic average price-to-sales ratio' of 1.155652473

Firm name and ticker code BP p.1.c. (BP) Royal Dutch Shell plc (RDS-A) ConocoPlillips (COP) Arithmetic average price-to-sales ratio: Estimate the Terminal Value (TV) at year 5 was based on the 'arithmetic average price-to-sales ratio' found above rather than the perpetuity formula. Annual sales (last reported, in same units as other items listed above) Equity market capitalisation (in same units as other items listed above) 180366000 70880000 180543000 140440000 18784000 43130000 1.155652473 Price-to-sales ratio 0.392978721 0.777875631 2.296103066 1.155652473 Firm name and ticker code BP p.1.c. (BP) Royal Dutch Shell plc (RDS-A) ConocoPlillips (COP) Arithmetic average price-to-sales ratio: Estimate the Terminal Value (TV) at year 5 was based on the 'arithmetic average price-to-sales ratio' found above rather than the perpetuity formula. Annual sales (last reported, in same units as other items listed above) Equity market capitalisation (in same units as other items listed above) 180366000 70880000 180543000 140440000 18784000 43130000 1.155652473 Price-to-sales ratio 0.392978721 0.777875631 2.296103066 1.155652473