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A young sumo wrestler goes on a special diet to gain weight. The variable $w$ models the wrestler's weight (in kilograms) after the wrestler has been on a special diet for $t$ months. The equation $w=80+5.4t$ models the situation. How much weight does the wrestler gain every $2$ months?$\newline$(A) $11$ $\newline$(B) $10.8$ $\newline$(C) $9.7$ $\newline$(D) $12$