book Maths Puzzle Numerical Ability

I need to solve a problem like this the store brand is 72percent of the cost of the national brand and I need to use a c. The differnce is $16.80. Find the cost of the national bra

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. Carlos and Mike agree to have a bicycle race. Each will leave his own house at the same time and ride to the other’s house, whereupon the winner will call his own house and lea define relation?