Xét tính chất phản xạ, đối xứng, phản xứng, bắc cầu của quan hệ 2 ngôi sau: Cho X = R
a) a T b <=> 2a + 3b < 1500
b) a H b <=> 2a < 3b + 15

So don't take my word i'm not exactly a mathematical person but i would assume a. because while selling the soap every month you increase in sells so you would by 11 percent. the you would get the factor 0.89 which if i had to guess would be the monthly profit over 11 probably wrong tho