Answer:
47%
Explanation:
Sales in May =52900
Sales in June = 78000
Let sales in May be represented as x and June be y
% increase in sales from May to June = y - x /x times 100%
78000-52900 /52900 x 100
25100/52900 x 100%
0.47 x 100%
47%
Therefore, the percentage increase in sales from May to June is 47%