Using the BDMAS rule , find the values of 18×(-6+4)÷9​

Step 1: 6x-10=1; step 2: 6x=11

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