howwould i solve to calculate for the percent recovery with onlyhaving these numbers?

Table Styles Borders Results: Chemical Name Mass (grams) Melting point Percent recovery 4 Chloroaniliine 0.902g 68C-70C Benzoic Acid 0.870g 120C-122C Naphthalene 0.729g 80C 84C Mass of 4 chloroaniline - 0.902g Melting Point of 4-chloroaniline - 68°C 70°C Mass of benzoic acid = 0.870g Melting point of benzoic acid - 120°C-122°C Mass of Naphthalene = 0.729 g Melting point of Naphthalene-80°C 84°C Foca