What else could you call the least common multiple in an addition or subtraction problem invloving fractions

The marked price of an article is 25% above its selling price and the cost price is 30% less than its marked price . find the discount percent and gain percent. only a brainlest can solve it i will mark you brainlest

See attachment below and find the equivalent of tan(∠qsr)

Agallon of apple juice cost $7 a pack of eight 4.23oz box of apple juice $2.39 which is a better deal