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The following table shows the percentage change in the consumption of electricity by five towns P, Q, R, S, T from 1986 to 1988: Town Per cent change from 1986 to 1987 From 1987 to 1988 P +8 −18 Q +15 −11 R +6 +9 S −7 −5 T +13 −6 If town T consumed 500,000 units in 1986, how much did it consume in 1988?

  1. (a)371,000 units
  2. (b)531,100 units
  3. (c)551,100 units
  4. (d)571,100 units
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Official answer(b) 531,100 units