I will give brainiest to whoever answers correctly !!

a) $96     b) 4.85%

Step-by-step explanation:

Cash cost: 4400

10% down: 4400 * 10% = 440

Rest cost she owed: 4400 - 440 = 3960

6 month paid: 676 * 6 = 4056

Finance interest paid: 4056 - 3960 = 96

calculate by simple interest rate (r: annual rate): 3960 * r * t     ( t = 6 month = 1/2 year)

3960 * r * 6/12 = 96

r = 0.0485   (4.85%)

check: 3960 * ( 1 + 4.85% * 6/12) = 4056 = 676 * 6

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

step-by-step explanation:

infinity is the answer