Every annual plan (Specially reseller plan) has up to 50% off compared to monthly plan.
R1 cost annually cost $60 ($10*12- 50% off=$60)
R2 cost annually cost $120 ($15*12- 35% off=$120)
R3 cost annually cost $180 ($20*12- 25% off=$180)
R4 cost annually cost $240 ($25*12- 20% 0ff=$240) (R4 has Free dedicated IP with annual plan: Worth $60)