Problem : A reduction of 20 percent in the price of tea enables a purchaser to obtain 4 kg more for Rs 80. The reduced price per kg of tea is ;
a. Rs 4 b. Rs 3 c. Rs 7 d. Rs 8
Finite math, business math –
Let the original price be Rs ‘y’ per kg
20 percent of this price;
So new price per kg can be calculated by subtracting this 20% of y – from original price ‘y’
Now According to statement of question – purchaser gets 4 kg more – if Rs 80 given more!
i-e For new price he gets 1 kg (because this is the new price per kg) – and if he gives Rs 80 more he will get 4 kg more i-e 1+4=5 kg he will get !
Put this value of ‘y’ in New Price above