High cholesterol in the blood can cause fatty deposits called plaques to form on the walls of blood vessels. Suppose a plaque reduces the effective radius of an artery by 30%.$\mathrm{<br>}$ What is the percentage of the new speed caused by this blockage compared to the original speed? By how much would the effective radius of an artery have to be reduced to in order to have a 49%$$increase in the blood speed through the blocked area?