How is 1/8 bigger than 1/10

1/8>1/10

1×10>1×8/10×8

10/80>8/80

1gm = 1000mg so 0.1gm = 1000mg

first, convert the weight to kg

160lb * 1kg/2.2lb = 72.7kg

next, the dose

72.7kg * 100mg/kg = 7270mg

5 feet of chain cost $9

so the answer is 1.80