Costs, estimated earnings, and billings on uncompleted contracts are summarized as follows:
| 30-Apr-13 | 30-Apr-12 | |||||||
| Costs incurred on uncompleted contracts | $ | 645.990 | $ | 1,414,293 | ||||
| Estimated earnings | 268,767 | 432,821 | ||||||
| Less: billings to date | (901,634 | ) | (1,645,512 | ) | ||||
| Total | $ | 13,123 | $ | 201,602 | ||||