Directions Q. 1 to 4: are based on the following information:

The following table gives the sales details for text books and reference books at Primary/Secondary/Higher Secondary/Graduate Levels.
YearPrimarySecondaryHigher SecondaryGraduate Level
19754213788206530325343
197653568102857160227930
197758770164377366728687
197856872154757166830057
197966213175007869733682
198068718201778217536697


What is the growth rate of sales of books at primary school level from 1975 to 1980?

Options
- 29%
- 51%
- 63%
- 163%

CORRECT ANSWER : 63%

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