2. The annual articulated boom drill records indicate the following: Av = 60%; Ut = 50%; P1 = 20% of DOH; NT = 20 days/yr; average penetration rate 16m/hr. Determine the articulated boom drill requirements, if 30 buffer blast blocks of similar size with dimensions of 100m long, 30m wide and 10m high with a density of 3.4t/m3 and a drilling yield of 35t/m are drilled per year with articulated boom drills, together with a presplit along the 100m long side of the buffer blasts with a drilling yield of 120t/m (presplit yield tonnes relate to the tonnes per buffer blast