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...Edexcel a level economics calculation practice book scan the qr code above to view suggested answers activities in this study notes revision videos exam technique advice you ll find everything need for at www tutoru net follow on twitter tutoruecon student name sku contents chapter ratios and fractions page percentages percentage changes points quantitative skill calculate use understand averages means medians essentials rates of change ratio is way comparing two numbers can be represented different ways including as fraction or economists number example quantiles concentration these are used help measure particular market if largest three firms have share between them then we would say that firm real nominal c productivity output inputs e g per person hour worked index demography such dependency younger older people population labour force participation proportion working age interpreting data tables other graphical forms elasticity all ped yed xed pes types they express one variable ...