1.915 * 2/3 = 1830/3 = 610
1005 * 2 /3 = 670
123 * 2/3 = 82
2. 1200 * 4/100 = 48
250 * 4/100 =10
350 *4/100 = 14
3. 450 * 10/100 + 200 * 5/100 - 100* 2/100 = 45 + 10 - 2 = 53
4. 4500 * 13/100 - 300 * 9/100 - 250 * 2/100 = 585 - 27 - 5 = 553
5. 1/5 * ( 5/2 * 3927) = 1/5 * 9817,5 = 9817,5/5 = 1963,5