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As appears from the order for reference, the provisions of the General Law on Social Security (ley general de seguridad social), approved by Royal Legislative Decree No 1/94 of 20 June 1994 (BOE No 154 of 29 June 1994, p. 20658; ‘the LGSS’) applicable to the main proceedings are the following: ‘Article 160. Concept Contributory retirement benefits shall be unique to each beneficiary and shall consist in a pension for life under the conditions and in the amount and form determined by law when a person reaches the prescribed age and ceases or has ceased to be employed. Article 161. Beneficiaries 1. A person covered by this General Scheme shall be entitled to a contributory retirement pension if he satisfies the general condition laid down in Article 124(1), and if: (a) he has reached the age of 65 years. (b) he has completed a minimum period of contribution of 15 years... Article 162. Basis for calculation of the retirement pension 1. The basis for calculation of the retirement pension, under the contributory scheme, shall be the quotient given by dividing by 210 the contribution bases of the interested party during the 180 months immediately before the month preceding the event giving rise to the entitlement ... Seventh Additional Provision. Rules applicable to part-time workers 1. Social protection deriving from part-time employment contracts shall be governed by the principle of assimilation of the part-time worker to the full-time worker and specifically by the following rules: One. Contributions. (a) The basis of social security contributions and of the amounts collected together with the instalments thereof shall always be monthly and shall be constituted by the payments actually received for the hours worked, both ordinary and overtime. (b) The contribution basis thus determined cannot be lower than the amounts determined by law. (c) Contributions in respect of hours of overtime shall be made to social security on the same bases and at the same rates as ordinary hours. Two. Contribution periods. (a) In order to give proof of the contribution periods needed to give entitlement to retirement pensions, permanent invalidity allowances, death and survivors’ benefits, temporary invalidity allowances, and maternity and paternity allowances, only the contributions made in respect of the hours worked, both ordinary and overtime, shall be taken into account and their equivalent number of theoretical days of contributions shall be calculated. To that end, the number of hours actually worked shall be divided by 5, which corresponds to 1 day if a total of 1826 hours per annum is taken into account. (b) In order to give entitlement to retirement pensions and permanent invalidity allowances, a multiplier of 1.5 shall be applied to the number of theoretical days of contribution obtained in accordance with point (a) of this rule, and the result shall constitute the number of days regarded as credited for the purposes of determining the minimum contribution periods. Under no circumstances may a higher number of days covered by contributions be taken into account than the number that would be obtained if the services had been provided full-time. Three. Bases for calculation (a) The basis for calculating retirement pensions and permanent invalidity allowances shall be calculated in accordance with the general rule ...’