Asnowmobile manufacturer claims that its newest model is 15% lighter than last year's model. if this year's model weighs 799lb., how much did last year's model weigh? how do i get this answer i need ?

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Amass weighing 16 pounds stretches a spring 8/3 feet. the mass is initially released from rest from a point 2 feet below the equilibrium position, and the subsequent motion takes place in a medium that offers a damping force that is numerically equal to 1/2 the instantaneous velocity. find the equation of motion if the mass is driven by an external force equal to f(t)=cos(2t).