Deterministic Operation Research Model Question please help

Deterministic Operation Research Model Question, please help! And I\'m using LINDO

Before leaving for the holiday you wish to backup your most important files onto CDs. These files have sizes 240, 462, 117, 560, 379, 110, 341, 294, 503, 469, 90, 63, 617, 493, 524, and 396MB. If the capacity of a CD is 780MB, formulate and solve a model to determine the minimum number of CDs needed to save all the files.

Solution

Sizes of files = 240, 462, 117, 560, 379, 110, 341, 294, 503, 469, 90, 63, 617, 493, 524, 396MB

Total sum = 5658

Each Cd has capacity = 780 MB

63,90,110,117,240,294,341,379,396,462,469,493,503,524,560,617 is ascending order.

If partial data cannot be stored in a Cd, to put maximum usage we have to take as

617, 90, 63 in one Cd (total 770) (so that min wastage of 10 mb in one cd)

Likewise (560,110 ) in one cd (total 670)

iii)(524,240)

iv) (469,294)

v) (503,117)

vi) (341,396)

vii)379, viii)462 ix ) 493

Totally 9 Cds are required in minimum.