2. Solve the cargo-loading problem of Example 10.3-1 for each of the following sets of data:

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(a) Wt = 4, rl = 70, ~ = 1, rz = 20, w3 = 2, r3 = 40, W = 6

(b) WI = 1, rl = 30, Wz = 2, rz = 60, W3 = 3, r3 = 80, W = 4