If all are sold at 1.4 yuan per kilogram, you can earn 40%, that is, the total * * * can be sold at 200*( 1+40%)=280 yuan.

In fact, I only earned 10%, that is, I actually only sold 200 * * (1+ 10%) = 220 yuan.

Suppose that X kilograms of tomatoes are sold at a price of per kilogram 1.4 yuan, and the total amount of tomatoes is Y kilograms.

Then1.4 * x+(y-x) *1= 220.

1.4*y=280

So y=200

x=50

So 50 kilograms per kilogram is sold at 1.4 yuan. ...