GRE Exam Numerical Ability Percentage

a trader claims to sell his goods at a loss of 8% but weighs 900gms in place of kg weight find the real loss or gain percent?

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GRE Other Question

a merchant mixes three varieties of rice costing rs20/kg ,rs24/kg and rs30/kg and sells the mixture at a profit of 20% and rs30/kg how many kgs of the second vareity will be in the mixture if 2kgs of the third variety is there in the mixture? rs. 38 is divided between A,B and C such that B has rs. 5 more than A and C has rs. 10 more than B. how much did C get?
Options : a). 15 b). 17 c). 19 d).20 , e). 21