Efficient pythonic way to multiply elements(which are tuple) of each row represented in ndarray structure

Question

The data is represented as below.

[[1 (1, 2.5) (1, 3)]
 [2 (2, 5.7) (1.6, 4.1)]
 [3 (3, 7.3) (5, 6)]
 [4 (6, 9.1) (1.6, 2.5)]]

Discarding the