A rectangular block of alloy having dimensions 4.30 cm by 7.20 cm by 12.40 cm was melted and recast into a frustum of a square pyramid, 10% of the material being lost in the process. If the ends of the frustum are squares of sides 3 cm and 8 cm, find height of the frustum. 10.69 cm 11.64 cm 12.32 cm 12.98 cm

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