In the following atomic model, where does the strong nuclear force happen? mc006-1.jpg outside a between a and b between b and c inside c

Two pans of a balance are 24.1 cm apart. the fulcrum of the balance has been shifted 1.33 cm away from the center by a dishonest shopkeeper. by what percentage is the true weight of the goods being marked up by the shopkeeper? assume the balance has negligible mass. answer in units of %.