Jerry, owner of a retail shop, does not maintain proper accounting records. He seeks your assistance to calculate his sales revenue in the year. He habitually banks his daily takings intact, leaving a float of £100 to meet incidental expenses and after taking £20 per day for household expenses. Incidental expenses paid in cash, recorded in his diary, amounted to £26,640. He makes other payments always by cheque and the total cheque payments in the year amounted to £595,400. His bank balance at the beginning of the year was £29,400 and at the end £41,800. His trade receivables were £18,400 at commencement of the year and £22,900 at the end. What was his sales revenue in the year?

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a £646,240 b £646,340 c £638,860 d £638,960