The profit in the first quarter is (510-400) *1=1/0 yuan. (selling price-buying price) * quantity = profit.
If the growth rate is 5%, the profit required in the second quarter is110+10 * 5% =115.5 yuan.
The price in the second quarter was 5 10 * (1-4%) = 489.6 yuan.
Sales volume increased by 10%, and the total was 1. Section 2,1+0 *10% =1.1.
(Never mind why the current number of pieces is 1. 1, which is not an integer, because we assume that the total number of pieces is 1, that is, 1 only represents the whole. )
Assume that the cost in the second quarter will be reduced by X yuan.
conditional
[489.6-(400-x)] *1.1=15.5 (current selling price-current cost) * sold quantity = current profit.
89.6+X = 105
X= 105-89.6
X= 15.4
The cost should be reduced 15.4 yuan.