In a town consisting of three localities A, B and C, the population of the three localities A, B and C are in the ratio 9:8:3. In locality A, 80% of the people are literate, in locality B, 30% of the people are illiterate. If 90% people in locality C are literate, find the percentage literacy in that town.

Using the ratio 9:8:3, assume the total population of the town is 20, making the populations of localities A, B, and C equal to 9000, 8000, and 3000 respectively. The number of literate people is 80 percent of 9000, which is 7200; 70 percent of 8000, which is 5600; and 90 percent of 3000, which is 2700. The total literate population is 7200 plus 5600 plus 2700 equals 15500; dividing this by the total population of 20000 and multiplying by 100 gives a literacy rate of 77.5 percent, which means the correct choice is none of these.

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