Krishnamurthy earns Rs. 15000 per month and spends 80% of it. Due to pay revision,his monthly income has increased by 20%, but due to price rise, he has to spend 20% more. His new savings are
Initial income = Rs 15000
Initial expenditure = $$ 15000 \times \frac{80}{100} $$
              = 12000
New income = $$ 15000 \times \frac{120}{100} $$
          = 18000
New expenditure = $$ 12000 \times \frac{120}{100} $$
             = 14400
New savings = 18000 - 14400
          = 3600
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