Who can solve this economics question ??? On PED elasticity Urgent help? I?

I looked up cross elasticity on wikipedia.org which is, %change in demand for product A/%change in price for product B. so if the cross-elasticity coefficient is 1.2, then this means that a 25% reduction in the price of coffee results in a 30% decrease in the demand for tea. before retiring the evening of this post, I said that I could not provide any empirical evidence to support advice against making that cut because I did not have coffee's elasticity of demand and I heard(in my head) that I could make that correlation with the information provided. it seems that she made the assumption that the price elasticity coefficient of -3 is for coffee after I provided the correct answer. so, as I previously stated, i dont want to steal anyones thunder, but i want to wait until closing so that she wont steal mine as she has done in the past, this is capitalism here. i dont know why she would post a wrong answer after I posted the right one, but she has changed her answer in the past after I, and I suspect this will be an ongoing trend. anyway, like I said, since the price elasticity of tea is -3, then a 30% decrease in demand for tea would result from a 10% increase in the price of tea. a 10% increase in the price of tea would result in a 12% increase in demand for coffee due to cross-elasticity coefficient of 1.2. therefore, a 12% increase in demand corresponds to a 25% decrease in price of coffee and thus gives us the price elasticity of -.48. after doing the math, we see that a 25% reduction in the price of coffee leads to a loss of revenue for both coffee and tea which is why we advise against making the cut