“Un trabajador de servicios generales es contratado por medio de un contrato de prestación de servicios. La empresa y el contratista
acordaron que por día de trabajo se pagará 20€ y que por cada día que no se pueda trabajar
plenamente por fuerza mayor o caso fortuito se pagará 7€. Al cabo de 20 días de trabajo el
trabajador recibe 335€, ¿cuántos días trabajó plenamente y cuántos no?

introduction, methodology, results, discussion

step-by-step explanation:

an observational study is one which consists of actual observation to record data and then analyse the data.

there are a number of factors that should be analyzed before starting an observational study.

the main four factors are:

i) introduction:   this should be analysed to check whether the purpose of the study is correctly established and the data recorded are appropriate for the study

methodology:   the method of collecting the data, such as whether randomly selected, and whether sample size matches with the population to be studied, whether questions asked are easy to answer by common men, etc.

results: then results such as summary of data with comments should be studied thoroughly

discussion:   the last is the discussion, this can be either by management people or persons who are all interested , etc.

step-by-step explanation:

i believe its "c" because all of the other options include a but it could be d because there is a way of financing with cash at certain places but its uncommon.

c. 1,233 miles