Let \( s_1, s_2, s_3, \ldots, s_{10} \) respectively be the sum to \( 12 \) terms of \( 10 \) A.P.s whose first terms are \( 1, 2, 3, \ldots, 10 \) and the common differences are \( 1, 3, 5, \ldots, 19 \) respectively. Then \( \displaystyle\sum_{i=1}^{10} s_i \) is equal to:
