the answer is $65
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Carpets are sold per square meter (unless you find an off cut the size required). Your longest length is 7m, so your carpet will be 7sqm @ £20 per sqm = 7 x £20 = £140. Would exclude gripper rod, underlay and fitting though!
You write 325 in standard form as 3.25 × 102
1 meter is 100 cm 20% of 100 is 20 cm or 0.2 meter
108
Speed = Distance/Time = 5 metres per second