1。 A clothing store, making a fashion, each set of 90 yuan, increased the price by 50% to reward the retailer, and sold 2000 sets. Due to the changes in the market, it can only be awarded to retailers with a price increase of 20%. How many sets of this fashion should be sold at least under the condition of constant profit?

Establish at least x sets of sales.

2000*90*50%=X*90*20%

X=5000

2。 It is understood that individual clothing sales can be profitable as long as they are 20% higher than the purchase price, but bosses often raise their prices by 50%~ 100%. If you are going to buy a dress with a price tag of 200 yuan, within what range should you make a counter-offer? (accurate to one place)

Let the purchase price be x,

X( 1+50%)=200，X( 1+ 100%)=200，

100 & lt； X & lt 133,

So 120