The difference between two nearest values is 70 (210 and 280). So round off the numbers to the nearest integers. 29.8% of 260 ~ 30% of 260; 60.01% of 510 ~ 60% of 510 and 103.57 » 104 Now the equation will become 30% of 260 + 60% of 510 – 104 = ? 30/100×260+60/100×510 – 104 = ? 78 + 306 – 104 = ? ? = 384 – 104 = 280