UPSC CAPF AC 2019 Paper

The relationship between the Multiplier (K) and Marginal Propensity to Consume (MPC) is that, the multiplier relies on the MPC (Marginal Propensity to Consume).
Their relationship is given by the formula:
Multiplier (k) =

1

1−MPC

So, according to the question,
Multiplier =

1

1−0.90

=

1

0.10

=10