31) B

Step 1 : Using the Miller formula, we get the MHR = 217 – (0.85 x 60) = 217 – 51 = 166

Step 2 : Since the person is 55+, we need to add 4 beats. So we get 166 + 4 = 170

Step 3: Since the person is a swimmer, we need to subtract 14 beats. So we get 170 – 14 = 156 bpm

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