solve manually please

please solve manually and write the decision variables, the constraints and the objective

Al musbah for perfume industry produces 3 types of perfumes, each of them with different chemicals, the company's policy regarding employees' workdays in a year is: 260 days/year and the allowed off-days (sick leaves) is 21 days/year. The company decided to compare the number of off-days those employees take due to sickness in the first year to the off days they take in their 5th year in order to know the effect of the chemicals used on their bodies. It's evident that senior employees are more exposed to chemical smells which will make them more vulnerable for being sick. The company seeks to minimize the taken off days in order to improve its production. The off days that are taken by a 3- employee sample is as follows: Year 1 Year 5 Employee 1 7 13 Employee 2 9 17 Employee 3 9 16 Al musbah for perfume industry produces perfumes, each of them with different chemicals, such as phenol and methyl mercaptan. The company's policy regarding employees' maximum off-days changes depending on the the number of years the employees have been working for. The company decided to know the effect of the concentration of each chemical on the employees' bodies and thus their usage of these off-days. The relationship between the concentration of the chemicals and the off-days they use is directly proportional. The company seeks to minimize the off days that are taken in order to improve its production. The concentration for every chemical is as follows: phenol Methyl mercaptan Max days off Employee 1 0.05 0.02 20 Employee 2 0.07 0.04 22 Employee 3 0.08 0.1 24